What is it about PRIMARY paste that makes geeks love it so much?
You can’t use it to overwrite something (because selecting to overwrite… kills the thing that’s stored). Most mice have the middle button as a wheel, and clicking that is awkward. It’s also inaccurate: I tend to move the wheel a tiny bit, so I don’t paste where I meant to.
It’s non-discoverable. It breaks the rule that each application is its sacrosanct space (because gedit forgets its selection while I’m selecting in bluefish). It doesn’t follow standard GUI grammar.
What so hard about clicking and using CTRL-V? If your left hand isn’t on the keyboard, what’s it doing?