On the contrary, I've professionally seen even technical users get confused by their OS hiding the scroll bar, and them not realizing what they're looking for requires scrolling.
People literally did not know that you could scroll the share menu on some versions of android until they specifically added a "fold" to hide half an icon just so people realised that there was more options available. Hiding a scrollbar is so unnecessary. It's one of the best UI/UX elements ever created and people got it right so long ago
Frankly, it's broken behavior.