Hi! Welcome to the Snap! Forum.
Yes, we all wish that. It's on the list. One obstacle is reaching agreement between "Emacs-style" autosave (also "Microsoft Word-style"), in which the buffer is autosaved to a different filename so that your actual file doesn't change until you explicitly save to it, and "Google-style" autosave, in which your file changes without you knowing it. I fear I've described them in a way that makes my own preference clear, so in defense of Google, if you want to enable multiple simultaneous editors, it's important to have a "single source of truth": the one file that has everyone's changes in it, rather than my browser autosaving my changes and your browser autosaving yours.
But also of course we have a long list of desiderata.