It’s all about simplicity and the 80/20 principle today, which means that designers are bound to look at usage metrics and clicks as evidence of a successful design. Upper management doesn’t have to care as long as the bottom line is doing well and they’re able to kill competition in other ways.
From a user standpoint, though, once you get attuned to the basic functionality you want more power features that cost a lot of effort to build but don’t really make you pay more for them. You just can’t win.
This is why we need competition.