To play devil's advocate:
What do those even mean and why should I care? I want to view my files and folders and click a shortcut to run a program and install steam. And I want that process to be stable and smooth and be both logically transparent and consistent.
There's too much I have to critically compare and understand in my life to want to add 'desktop GUI flavor' to the list.
You'll be able to view your files and folders and click a shortcut to run a program. And that process will be quite stable and smooth, I'd argue even more than on Windows, since you can actually find useful apps on the "store", as opposed to having to hunt on random websites.
If you want consistency, presumably over time, then yeah, you may not get that. But neither will you on Windows, who've changed the explorer in Windows 10 and now again in Windows 11. The explorer-like app that seems to have been the most stable is Finder. But then macOS changed in other ways...
It seems you can't really win at this, regardless of your OS of choice... So it think that's not fair to only throw Linux under the bus for this, while praising the others.
Dolphin has been basically the same for 16 years as far as I can tell/remember.
You want to use Gnome? Use Gnome. You want to use KDE? Use KDE. I3? ditto. Etc.
Oh, some random GTK app will look weird on KDE? Tough. Every Windows app looks different, and even MS's apps always felt out of place on their own OS. And with the proliferation of Electron apps, nothing ever looks "native" anymore.
> while I don't know if anything that has been built 2 Ubuntu LTS releases ago still works
Maybe, maybe not. But that's also an issue on MacOS. And while Windows prides itself on backwards compatibility (and mostly delivers), that doesn't come free.
There's also hardware backwards compatibility. Many devices that used to work with older versions of Windows or MacOS just don't work anymore. Even those that never required custom drivers from their manufacturer. On Linux, if it works once, it'll usually keep on working. I have such an issue: a PCIe USB 3 card, so it isn't even something that old. Used to work with MS Win 10 provided drivers, now (win 11) it's unusable.