The game currently has a lot of joint mobility, and that is good for quite a few things, but the lack of restrictions in some joints has led to very easily 'janky meta' strats, like ground hugging, neck pain movesets to leverage the protection from the cheaper helmets, and so forth.
I'm definitely not proposing a blanket 'just make us a lot less flexible' thing, but some slightly harsher limits like total head bend in relation to hips, or feet height in relation to hips to avoid overly ground huggy movesets that aren't as fun to fight, but comprise a lot of the current meta.