Unlike the chiclet keys, where they trigger at the bottom, so you are always bottoming out and pushing against a "wall".
Everyone has different problems though. I have no problems from hurting my fingers when typing, or carpel tunnel. But I do have messed up shoulders, and having them internally rotated all day is my biggest issue.
The biggest relief for me was a fully split keyboard so that I can have my shoulders neutral rather than rotated. Other people have no problems with their shoulders.
Most of these ergonomic things do help _someone_, I wouldn't claim that they don't work just because they don't help you.
There are also many mechanical switches with little travel and low force (eg. Choc v1, Kailh Super Speed).