[revscat]

Echoing others: I have the tmux copy/paste mapped to my system pasteboard. Ditto nvim. I do not use the shell buffers.

The cognitive load you are concerned about can be configured away, and for me is a solved problem.

[adverbly]

Works great till you want to copy a ton of text. I frequently need to look up some command to dump the tmux scrollback to a local file because I could only get a couple thousand lines from the buffer.

It's the best option I've found, but it's not all smooth sailing for me at least.

[nikisweeting]

Same on macOS with iTerm's Tmux integration, everything just uses the system clipboard buffer seamlessly, even when copying inside tmux on a remote ssh connection.