Middle click paste is a very useful feature for a lot of people, but new linux users are not those people.
I personally switched two years ago, and got several people I know to switch too. Everyone I know who switched (including me) was confused by middle click paste.
It’s a hard to intuitively understand action (took me several months until I understood it took the selection for some reason) that is very easy to trigger accidentally, and that duplicates existing functionality.
The people who like it already know it exists, and could just toggle it on.
Of course, on distros not aimed at beginners, like say, debian, it should remain the default.
Having the buffers separate is useful because you can have two different things copied at the same time.
yeah, I use it all the time to copy username and password in one go instead of fiddling with the clipboard history
This is remedied for me by the clipboard history in the system tray in KDE. I can have a lot of things in my clipboard and access any one of them whenever I want
Sure, there is a usecase for this. But sperate buffers and varying (and often unintuitive) behavior of software and which buffer is used how is a much bigger hurdle for people not used to it than that “middle-click pasting is confusing” bullshit…