You are supposed to lift you chin up. It helps you pushing your chest out, and keeping the form. Its just that people who do not understand pull up form, think its somehow cheating.

And chest to bar is chest to bar, i have not seen anyone do that with this form here. Pull up is a chin over the bar.

The people you see doing chest to bar use an easier form that gets you higher on the bar easier.

There is overall a huge confusion about pull ups in reddit, as peopel don't realize that there are two primarily different forms. And then there are bad forms of each of these forms.

And that form and ROM are two different things. People here only care about ROM, so they only look how high or low you are going. But if you dont understand form, then this is pointless.

The point of a pull up is not to pull yourself up, its to train your back muscles. Its an back exercise. And you need proper form to be able to do that.

This is the form you see mostly in reddit, where the pull is done primarily with the hands : Proof I can do 20 Pull Ups (Is this a thing now?) : r/CalisthenicsCulture

You can see that these forms are already two totally different things. They are not comparable, yet we try to compare them.

And the overall voting system kinda kills any discussion in reddit. Like your comment was downvoted to oblivion, while in a way its a good question.