I would say you miss one important point : for game. Yes. But for the write speed, it’s the worst. So when you download a game directly on a sd card it’s so fucking slow if you have a decent network connectivity (like 2gb/s) because the write speed is limited.
In game, no difference, but the writing speed is a no go for « only » sd card deck
Well the limite of the steam deck writing on a SD Card is 100 MB/s so it’s pretty limited depending of the internet bandwidth. I more between 250-300 when I download on steam