Lemmy faces the same expectations problems as every free/libre software
It's the same as with Linux, GIMP, LibreOffice or OnlyOffice. Some people are so used to their routines that they expect everything to work the same and get easily pissed when not.
I'm using the browser from my laptop (phone screens are too small when the laptop's there) and lemmy is surprisingly good in all aspects. The only UI issue noticeable to me is that it doesn't remember my previous position in the feed when I press back, but that's also the case in many large platforms, lol.