This + some other quirks are what have kept me off KDE for a good while. I understand wanting to do things differently, possibly easier -- but it's hard to break old habits.
It may mean the user doesn't think their use is similar enough to the people who make the distro/DE, or trust the distro makers' decision making ability.
If a distros' makers think snaps are a good idea, or that the distro shouldn't by default show available security updates, or have a UI that hides how many open instances there are of a program unless you hover over an icon, or hides the titles of those open programs, or hides panels; then the way I use a PC is too different from the way they do - and there are likely more things in the background that we disagree with which can't as easily be changed like UI settings.
I can understand why someone don't want to use GNOME, because the defaults can suck for some people. And not everything is configurable. But KDE? Can be configured about anything imaginable. While I understand that not everyone want to go full in to learn everything, I still don't get the default setting for a simple switch like double/single mouse click is a big deal not to use the environment.
If you really like KDE and are used to it, then you won't change to something else just because the next update changes the default value (for new installations only BTW) of mouse click setting.