The real issue is that Apple has control over its devices after sale. That it decides what they can and cannot run based on its own arbitrary rules that no one can challenge. That it can literally put other companies out of business by denying them the privilege of having an iOS app.
That was really easy, and I'm not even a lawyer.
My personal favorites were the 2010-2012 mac pro. keyboard on first generation macbook pro with keys that were concave not flat. unibody on later macbook pro - the one with ports and sd card. I will say the iphone peaked for me at the iphone 8, which is relatively recent.
As a shareholder or a product user?
Shareholders want to make money. Users do not always have the power to change things, when things are going off the rails and a tilted playing field is forming.