This feature is entirely used for either griefing, spam tackling during hijack while on ship (which I'd argue falls under griefing too, it doesn't let you evolve or do other things you want to do like plant eggs) or accidentally tackling a xeno when you're trying to help cap a marine.
I see nothing good about leaders being able to shove, does anyone actually like this?
Just remove it from the game, please. Or at least make it so a xeno can only tackle you once every minute or something rather than being able to spam tackle