That's a pretty common take. Lots of people don't want teammates or opponents in their multiplayer games who are still figuring out the basics of play (or in equipment/gear/level-based games, have none).
In games with skill- or level based matchmaking it's not that bad provided there is enough of an active player base to isolate the newbies to their own pool, but not all games have either of those two things, never mind both.
I don't even remember anything in AC6 I would consider a tutorial. Unless he means the first 5 minute mission.
OP, the only multiplayer you missed playing with your sister was pvp, and you would have been absolutely shat on if you went into pvp. And you would shit up the games for other people too, because no one wants to fight a bunch of noobs all in the same starting gear who don't know how to move (or worse, have them on your team).
Aside from all of that, desktops are also far less constrained. If you have a CPU whose performance scales well with power (ie not an M2 but maybe an M3) you can slap it in a desktop and be able to give it 500 watts of power and a giant ass cooling setup to enable that performance. You can't do this with the physical constraints required of a laptop.
Yeah less savvy people are going to do what they always do, just keep running their old system but now with even more vulnerabilities due to lack of security update availability.
My dad recently asked me to help with his laptop, which turned out to be running windows xp.
After a lot of hair pulliing I got it kind of working but am gonna give him an old windows 10 (upgraded from 7) laptop, but he's probably going to be on that indefinitely.
Much more limited these days. F1 teams all have to stay within a budget cap these days, and while the top ones are still benefitting from the money they poured into R&D before the caps, ongoing investment is much more limited.
I think there are fairly good odds none of my gaming friends have ever bought a CoD game.
Not that we all play amazingly refined games, there is plenty of junk and regret-ware, and a lot of other FPS games - just no one ever got into CoD.