No, this is exactly the opposite. If you lock in your users in an ecosystem that's compatible with exactly nothing outside, they will happily eat your marginal updates for years. Even if problems would endure, Apple can plan calmly, as the switch would be much more costly for its customers.
I'd say it's too soon to call the updates marginal. This is a process improvement with some, small, architectural improvement. You can't pull an M1-level improvement on every generation.
