It’s that last bit — the multiple generations bit — that is of interest here. Apple first released its notorious butterfly keyboard in April 2015, and has only now replaced it in 1 model in November 2019. Over that time period the company has sold $99b worth of Macs, the majority of which have been laptops. This is truly the power of integration! Or, to put it another way, the power — and downside — of monopoly. No, Apple does not have a monopoly in computers — how amazing would that be! — but the company does have a monopoly on macOS. It sells the only hardware that runs macOS, which is why millions of customers kept buying computers that, particularly in the last couple of years, were widely reported to be at risk of significant problems.
2021-02-04: On the many ways Apple is sketchy as hell, and what can be done about it.