People want Linux to act like other operating systems because:
1. They want an easy alternative that doesn’t require extensive relearning should their original OS of choice become unpalatable for some reason
2. Advocates of desktop Linux have endlessly sung praises about how customizable it is and how that flexibility is a core tenet, so why shouldn’t it be able to act identically to Windows or macOS, at least as far as UI goes?
The first is particularly big, because remember that at this point a lot of people have decades of usage of Windows/macOS under their belt, and even if switching to Linux is a practical consideration for them, such users probably aren’t keen on tossing out all their little bits of power user knowledge and productivity boosting tricks and having to start out from almost scratch.