I think people are more complaining about windows crashing on updates or Microsoft putting ads everywhere or forcing one drive

That’s way more than just the “position of the start menu”

For Windows, you also have an ad, an AI, or both appearing in every other app.

On the specific issue of window corner roundedness, Windows 11 is great IMO. The corners are rounded when the window is floating free, but change to square when it's maximized or snapped to a side of the screen. The perfect design.