Allow stealth walking, standing properly erect just moving slow and quiet
Crouching is almost never how you be sneaky. Not sure why games made that be a thing and its stuck.
If you're not moving, sure, crouch down if you want to. Ever tried crouched sneaking? It takes WAY more energy, it is not quieter or easier or sneakier in any way. Its difficult, silly, draining and you are FAR more likely to make noise.
Crouched or vertical, if something is already looking in your direction, you will be seen.
While stationary, crouched and prone make sense. On the move, let me hit caps lock and walk nice and slow and quiet. Like an actual human being sneaky in a way that is effective and makes sense and works. Especially using a bow.
Noone in the history of ever is moving around in a half squat thinking that does anything. Probably came from bad movie representation of ninjas or anime. Certainly isn't based on reality.
It really grinds my gears. Can be unseen, unheard, unmoving..... but not crouching???? NOT STEALTH!!! Its so obnoxiously silly.