My single biggest problem on the iPad is the way Safari just randomly kills your background tabs. Filling out a web form? You'd better hope that their half-baked tab state saving worked! (Spoiler alert: it probably didn't)

It's particularly annoying because of the headline features of iPadOS was that you could finally use Google Docs in Safari! It's actually amazing how well it works...until you switch tabs or apps and have to wait for your entire spreadsheet to reload.