OR the fact that textures are increasing in resolution and audio in quality means that the amount of data to move is increasing as well and the incredibly limited bandwidth of old mechanical hard disks is becoming increasingly inadequate.
It's not even a novelty, incidentally. A lot of games have started to become sub-optimal experiences on mechanical hard disks for more than a decade at this point. Battlefield 3 and 4 were already unbearably slow to load on one.
Party control in Baldur's Gate 3 is a complete mess that begs to be addressed. SAY NO TO THE TOILET CHAIN