My point is that I'm not sure even how I would "address" these issues that you are insisting Linux Desktop evangelist "stop excusing". That is, 1) I'm not getting paid to work on Linux DEs or have the time (right now) to volunteer, and 2) I don't think you could get 10 people in a room to agree how a DE should behave. Like, what would I change to what? I've consumed plenty of blog posts complaining about UI inconsistencies on Windows, macOS, or Linux, but these all still seem like preferences with no single "correct" answer as to how a GUI should be.
Even taking the one concrete example you provided in this thread, Apple's App Store is incredibly popular -- in fact in the US it has a 56% marketshare [1] -- so why would a Linux OS moving toward what you prefer would increase adaption? I really see no actual evidence of this; as in the example you give is literally the most popular way to do it. That said, I don't even think it matters either way. I've grown cynical enough by now to realize that humans are a lot more complicated, markets more monopolistic, and purchasing habits are better explained by market researchers than developers (or even HCI researchers!)
[1] https://gs.statcounter.com/os-market-share/mobile/united-sta...