MagSafe was at once an example of a port changed (MagSafe 1 to 2) and a feature removed (replaced with USB) that didn't fit your explanation "removing a common failure point". Even Apple didn't try to claim that slowing down old phones was a well-designed compromise; instead, they apologized. And there are many examples of Apple removing apps for reasons other than "app quality/safety", for one such example, see my response to sibling reply.
These are not "other different issues", these are counterexamples. They may not be the issues you thought of when you read my first post but they were some of the issues I was thinking of.