Yeah, I try to avoid "sudo pip install" for CLI utilities if I can (and discourage its use to others). I put ~/.local/bin on my PATH (nonstandard XDG -like convention) and use "pip install --user" instead.
I've seen too many Python environments hosed by folks who aren't Python experts to keep suggesting that "sudo pip install <CLI tool>" is a thing most users should be doing.
I use ~/.bin/ for what sounds like the same purpose. I'm not sure I'd call that a convention - it's just what made sense to me - but it does ease issues requiring that userspace executables be on my $PATH.
I've seen too many Python environments hosed by folks who aren't Python experts to keep suggesting that "sudo pip install <CLI tool>" is a thing most users should be doing.