Other than that for some reason people rush online games. There's very little time to think, especially with strangers. It's way less relaxed in my opinion.
Are people actively asking you to hurry up, or do you just get the impression that you're taking too long? That's another thing that I've noticed; turns online just take longer to play out. There are times where I know I'm going to have to think about a move, so I say something like "I need to think about this".
Sometimes people are complaining about playing slowly. Usually I'm not the target but it's still a shame because I can understand how the game can be overwhelming at times and it's hard to make decisions. People also resolve spells really quickly so you have like 1-3 seconds to make the decision whether you want to counter something or not.
I've also noticed this "thinking" that people say almost apologetically. Maybe it's just a matter of experience that I'm lacking but I actually need to think about my moves before doing them, otherwise I'll think about it afterwards and realise it was a dumb thing to do. This probably subconsciously makes me play fewer spells in general because I don't want to "bother" others by making them wait.
Yeah, overall the play experience is less satisfying for me. Shuffling the deck is about the only thing I do faster, and everything else just takes longer/is more complicated.
I've also noticed how quickly people resolve spells, but as someone who does that, it's difficult to know when to wait and/or how long to wait. If I'm resolving a game-winning combo, giant beater, etc. then I'll usually give like 10 seconds before moving on, but the overall problem is in-person, you can tell whether people are engaged or not, while online, you have no idea.
I also let people know when I'm thinking b/c, yet again, it's impossible to tell online whether a player is thinking or if they are afk, while in-person it's obvious.
Everything is just more complicated and less enjoyable, for a myriad of reasons.