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There is a reason Han Solo loves the Millennium Falcon.
Objectively, it is not the most reliable ship in the galaxy. It breaks down. It needs constant attention. It seems, at times, held together by instinct, improvisation, and a few well-placed spare parts. Indeed, there was a scene from the original Star Wars when Luke Skywalker explicitly said, “what a piece of junk!”
But that is precisely the point. Han and Chewie know the ship. They knows its quirks, its limits, its sounds, its workarounds. What might look to someone else like a liability has become, for them, part of the bond.
That, in a way, is mastery. Not just knowing how to use something when it works perfectly, but knowing how to make it work when it does not.
I have been thinking about this idea quite a bit in the context of Habit Lens research. When we study habits in healthcare, we often focus on triggers (cues), routines, rewards, and reinforcement. But one of the most powerful -- and often underappreciated -- forces sustaining a habit is mastery.
Mastery is what happens when a physician, patient, or caregiver has learned the nuances of a product or routine so well that it becomes part of their competence. They know how to dose it, titrate it, mitigate its side effects, explain it, troubleshoot it, and recover when things do not go exactly as planned.
And once that happens, the relationship to that therapeutic or medical product transforms.
The product is no longer just a product. It becomes something they know how to wield.
Within our Habit Lens model, mastery contributes to what we think of as investment: the degree to which a person becomes committed to a behavior through repeated practice, learning, and ultimately, making it their own. We borrow the term “investment” from Nir Eyal, who introduced it as a core component of his Hook Model.
This is something we see in everyday life. If you fix something yourself -- a car, an appliance, a piece of technology -- you feel differently about it afterward. You have put something into it. You understand it a little better. You feel a subtle sense of ownership.
The same dynamic shows up in medical practice.
When physicians learn how to use a therapy well, including how to manage its challenges, they often become more attached to it. They may recognize its drawbacks. They may know it is not perfect. But they also know how to navigate it.
That knowledge creates confidence. And confidence creates repetition.
Doctors are trained to master complexity. It is part of their professional identity.
They value knowing how to manage the difficult patient case, how to adjust the dose, how to anticipate the side effect, how to counsel the patient who is anxious or uncertain. When they develop that kind of practical expertise around a product, it becomes deeply reinforcing.
A physician may say, “Yes, this drug can be tricky, but I know how to use it.”
That sentiment really matters.
Because it reveals why a new product, even one with meaningful advantages, can struggle to displace an established therapy. The new product is not only competing against clinical performance. It is competing against accumulated expertise.
It is asking the physician to give up something they have already mastered and begin again. And that is not a small ask.
The same phenomenon exists for patients. Take, for example, a patient who has learned how to mix and self-administer a therapy. The process may be inconvenient. It may require planning, patience, and a certain amount of dexterity. But over time, the patient becomes good at it.
And that competence becomes meaningful.
It gives the patient a sense of control over the disease. It creates confidence. It may even become part of identity: “I know how to manage this.”
So when a new product comes along, the patient is not simply comparing convenience or efficacy. They are comparing a new promise against a hard-won sense of control.
That is why mastery can make people surprisingly resistant to change. Despite the fact that the current behavior is imperfect.
Nir Eyal’s Hooked model is useful here, particularly his emphasis on investment. Products become stickier when users put something into them: time, effort, data, identity, skill.
In healthcare, mastery is one of the most powerful forms of investment because it is established and solidified through experience.
Each has invested in the product by learning how to make it work. That investment strengthens the habit loop.
And once the loop is reinforced, it becomes harder to disrupt.
For commercial teams, this has important implications.
If mastery strengthens habit, then launch strategy cannot stop at awareness or even trial. It must help customers become good at using the product. That means training should not be treated as a support function. It should be treated as a strategic lever.
The goal is not simply to inform physicians how a product works. It is to help them feel capable using it in the messy, variable conditions of real practice.
Those are not tactical details. They are habit-building micromoments.
This may sound counterintuitive, but not all friction is bad. Some friction, when properly supported, creates mastery. And mastery creates attachment.
The problem is unmanaged friction: the kind that leaves physicians or patients feeling uncertain, exposed, or unsupported. But when a company helps customers overcome friction, it can actually strengthen the relationship with the product.
That is a very different way of thinking about launch. The question becomes not just, “How do we remove every barrier?” It becomes, “Where do customers need to develop confidence, and how do we help them get there?”
In the end, mastery changes the emotional texture of product use. It moves someone from trying a product to knowing it. From knowing it to trusting it. From trusting it to relying on it.
That is the path from adoption to habit.
And it is why mastery deserves far more attention in pharmaceutical brand strategy. As I have laid out in this article, when customers feel they have mastered a product, they are not merely using it.
They have invested in it.
And once that happens, change becomes much harder -- unless the next product offers not only a better profile, but a better path to mastery.
