Your point isn't wrong, but there was no "technical purity" motivation for not implementing it from the start. It's just difficult to do well, so we only implem

Your point isn't wrong, but there was no "technical purity" motivation for not implementing it from the start. It's just difficult to do well, so we only implemented the easy case (DosBox), and only the easiest of the easy cases (only one saved filesystem, no disk swapping, no ui, etc). It's the same as printing. Everyone writes hilarious complaints in the comments on the word processors about how printing didn't work. Of course you can't print! It's an emulator running in JS in your browser!!!1! But we have ideas for how to implement it, so maybe one day it will work after all. Saved games and networking are higher priority and are further along though.