> I'm trying really hard to come up with a scenario where optimizing the desktop experience for the average user is a bad thing.
Again, maybe I'm a sore loser, but it definitely feels like a lot of software is becoming increasingly hostile to me, personally because it's being optimized for a presumed average user. I have no beef with this average user and it's globally a totally correct optimization to make stuff work for them as well as possible, but it means that software makes tradeoffs that are inconvenient for me personally.
The most common use case is streamlined by removing options that clutter up the settings menu or banishing the buttons I press a lot into some tertiary menu, or niche features I rely on become unsupported and then get removed (of course with forced auto-updates, because the average user experience is improved by them) to free up developer bandwidth for the core features. And then I end up using a different off-brand window manager with the serial numbers filed off that barely works in general, but works for my specific 'workflow" exactly like I want it.
Of course, at the same time I also benefit from general improvements targeting the average user. It's only about the tradeoffs.