> I'm able to do all of these things too with my setup, although it's not vim driving my setup, it's tmux. Using just plain vim doesn't work for me.

For a while I was running (g)vim8 with the built in :terminal - but I had some character issues with meta mapping (so typing tings like ~ on my Norwegian keyboard layout was a chore). Qt neovim didn't have these issues, whatever caused them - but I also switched back to a tiling wm (i3) - and I'm not sure if screen in neovim term really is better than a neovim on one side and a terminal w tabs on the other.

What I will say is that vim8 has a "better" terminal out of the box than neovim (that realized the idea first) ;in vim switching out of insert mode is easy and allows real nice copy to buffer - say to copy from a repl, and switch windows to paste into a file.

The limit of one (two) x11 clipboards is a bit of a pain, but with setting the x clipboard to default copy/pasting between vim and the rest of the world becomes pretty painless.

Anyway - point being, vim/neovim has great support for managing terminals - but I'm not convinced it's a great idea.