Maybe when `:!` works the way vi does and POSIX says it must.
Just kidding, that will never happen.
vi compatibility is explicitly a non-goal for neovim
https://neovim.io/charter/
What are referring to, out of interest? Does this apply just to nvim, or vim as well?
vi compatibility is explicitly a non-goal for neovim
https://neovim.io/charter/