I tested being able to see through walls again and I was unable to reproduce being able to stick my head through a wall anymore on the test server by using hiding or running into walls.

I'm not sure this matters, you can still do it by swimming into a wall, however, this is such a rare situation that I'm not sure it needs to be addressed.

My main question about this tho is if unit collision is attached to the player hitbox? Like will this make people easier to hit with weapons? Or will it make people harder to hit with lower range weapons like knives due to not being able to get as close?

I'll do more testing later when I have more time.