Highlight, middleclick, job done
But the GP might be referring to the fact that copy and paste with anything but straight text is an outright shitshow on X. Compare to the copy and paste facilities from even ancient MacOS 6 it's downright stone age.
Improvements shouldn't break things.
If anything I find OS X more annoying, as things like screenshots into the clipboard work far less reliably.
Used Mac for almost three years.
Was enthusiastic when I got one and after close to three years enthusiastic to get back to Linux or even Windows.
I realize Mac users experience it to be much better and I guess with a different workflow it is.
I tried hard to pick it up. I failed miserably.
Going back was a relief for me.
It's not macOS' problem if people seem to prefer writing mediocre cross-platform apps than proper, native apps with full support for macOS-specific features like system-wide automation, proper integration with the system pasteboard, Quick Look, accessibility features, etc.
Or is this the projector problem again: when you plug a mac into a projector and it doesn't work, people blame the projector. When you plug a linux machine in, people blame linux.
I'd never heard of the projector problem, but given Linux's unreliable track record with multiple monitors, I'm not surprised people blame Linux. The problem as stated doesn't define whether or not the projector is actually at fault or not, so we can only really start diagnosis where intuition leads us.
I never realized there was a problem with clipboards on mainstream Linux desktops?
Edit: after a couple of minutes of thinking I have found one single thing that isn't consistent: when copying and pasting from/to a terminal I have to use ctrl + shift + c or ctrl + shift + v (understandable since ctrl + c is used to terminate running programs).
Personally I guess cut, copy and paste should have been moved to Super + x/c/v since they are global os-level shortcuts, but it would break the habits of many of us so I guess that should be configurable as well.