Not sure what you mean? In most app you can copy-paste with C-C C-V as on windows. Am I missing something?
This isn’t an issue in Mac because you use the Cmd key instead of Ctrl for copy, so there is no overlap
It does require a much larger time investment if you have specific needs.
The thing I most like about Linux is that most things, including the GUI, can stay unchanged if you wish so.
Windows and macOS are always moving targets, and while I found that exciting when I was young because new capabilities were leaps and bounds better than what came before, nowadays most changes are aesthetic and tiresome.
And this is not something a DE can fix, because the main problems are (a) the GUI app ecosystem is too heterogeneous on Linux and (b) laptop hardware-related issues like sleep, screen and camera control, trackpad and other input device drivers, and battery usage. To a lesser extent also peripheral support like printers and scanners.
A modern gnome these days is very user friendly and a lot of what you've learned can be applied there too. Things generally are quite straightforward, more so than on windows, at least on the happy path.
As for Desktop Linux. I found only AntiX as only usefull distro for now.
Every time I try desktop Linux I get rid of it when it does not even have copy and paste consistently implemented and compatible with Mac/Windows copy paste. This is the absolute most basic minimal thing a desktop needs to implement because it’s what users do every 60 seconds. I’m not pressing three keys to copy, sorry.
Copy and paste was invented at Xerox PARC in the 1970s, and desktop Linux still hasn’t worked it out.
And then there’s the visual and look and feel sense that it was made by Dr Frankenstein. Windows suffers from this too but not like Linux which is awful.