While I agree that Windows has long since abandoned UI/UX consistency, it's not like that is unique: On desktop Linux I regularly have mixed Qt/KDE, GTK2, GTK3+/libadwaita and Electron (with every JS GUI framework being a different UI/UX experience) GUIs and dialogs. I'm sure libcosmic/iced and others will be added eventually too.
Why does that matter if that’s not how most users do it? There is no magical dividing lines between a distribution and the user choosing to install a random collection of apps on their own.
For instance where exactly do you draw a line between which app/package/component is part of a Linux distribution and which is third party? OTH it’s more than obvious for proprietary systems.
To be fair almost all Linux distros are as bad if not worse in this regard.
Things like YAST which are supposed to fix that are unambiguously horrible in their own right (extremely slow, crappy UX etc)
Besides the many issues with the desktop itself, Windows offers piss poor filesystem performance for common developer tools, plus leaves users to contend with the complexity of a split world thanks to the (very slow) 9pfs shares used to present host filesystems to guest and vice-versa.
And then there's the many nasty and long-lived bugs, from showstopping memory leaks to data loss on the virtual disks of the guests to broken cursor tracking for GUI apps in WSLg...