A better product frequently fails to displace a worse one, and the reason is rarely brand loyalty. It is the cost the customer would incur in the act of leaving.
Switching costs are paid entirely by the customer
Migrating data, retraining staff, rebuilding integrations and rewriting internal procedures all consume the buyer's time and money, and none of it is captured by the incoming vendor's price.
So the comparison is never product against product. It is the incumbent's ongoing cost against the challenger's price plus the full cost of the transition.
A challenger can be clearly better on features and still lose that arithmetic, particularly where the incumbent is deeply embedded in daily operations.
The costs rise with time in place
Every year an incumbent system is used, more processes are built around its quirks, more historical data accumulates inside it, and more staff know only that way of working.
These accumulations are not designed as lock-in, but they function as it. The customer's own investment becomes the barrier.
That is why incumbency advantage grows even when the product stops improving, and why long-tenured accounts are the hardest to win.
Uncertainty is part of the cost
Buyers cannot know in advance whether a migration will take a month or a year, and the possibility of the longer outcome is weighted heavily because it falls on them personally.
The individual proposing the change bears career risk from a failed migration and receives modest credit for a successful one.
So the internal champion needs the improvement to be large, not marginal, before it is worth advocating at all.
Challengers can compete on the switch itself
Because the barrier is the transition rather than the product, entrants that invest in migration tooling, data import and parallel-running support are attacking the actual obstacle.
Some go further and reduce the perceived risk directly by allowing the old system to remain in place during a transition period.
These are unglamorous investments that rarely appear in product marketing, and they often move share more than feature work does.
High switching costs invite complacency and then punish it
An incumbent protected by switching costs can neglect its product for years without visible consequence, because dissatisfaction accumulates without producing departures.
The departures come later and together, typically at a moment when something forces re-evaluation anyway — a contract renewal, an acquisition, a system replacement elsewhere.
That is why incumbent share can look stable for a long time and then fall quickly, and why stability under high switching costs is weak evidence of customer satisfaction.