I used to have a coworker who could get by using her Office programs fine, but would freeze completely the moment something unexpected happened or there was an error message. She didn't really know how to find stuff independently or navigate the menus, but she had carefully memorized all the little paths and procedures she would need. She did good work with it, but any time there was an update that reshuffled some buttons she would be very distressed about it.

In hindsight I suspect she was dyslexic and having this mental map was her workaround for reading a bunch of buttons with unfamiliar words without clear contexts.

People are very good at figuring out ways to get by in their day to day and get around various personal challenges and limitations. Sometimes so good, you don't even realize they're doing it!