I strongly disagree. The intention may have been to avoid abrupt power downs but their implementation also made sure people upgraded their devices rather than buy a new battery because most people would never be able to imagine that a device could be slow because of a bad battery. This, IMO, was a dark pattern. A sudden power down would be clear indicator that something is wrong with the device while a gradual slow down of the device would seem like that the device is just getting older and needs to be upgraded to a newer one.
I would assume that like most Android phones and (2000s) windows laptops the phone is just old because of age and I need to buy a new one to get faster one.
> And you got phone which just switches off randomly.
I would assume that something is wrong with the phone and would get it looked into at-least once to know what the issue is. Apple would (presumably[1]) tell me its just the battery which needs to change nothing else and I would do just that.
[1] I have read articles where it is mentioned that even geniuses were unaware of the throttling feature.