IDK, my Linux desktop looks pretty nice, sleek, sharp, and utterly usable. It looks definitely better than my wife's gaming machine that runs Win10. In particular, it lacks visual rough edges, and is way, way more consistent. It also does not imitate macOS.

I dislike many UX decisions that Apple have made last 15 years. But I greatly appreciate their consistency and a presence of a design language. Last time I saw a consistent design language on Windows was Windows XP.