I use Fusion360 occasionally for hobby stuff, and its version 'control' is a joke, it's unfathomable to me how (especially since they're fellow engineers, technical people!) people can use and collaborate with it to build serious stuff.
I think there's a lot of money to be made and a potential huge turning point in end user software for figuring out 'git for non-technical users'. People will argue it's not even good for SEs (I happen to like it) UI sucks etc. but that's not the point, it's fine, GUIs exist, that'd be an easy problem if everything was stored in plaintext. The key will be in figuring out how you make it attractive to people building software for such users, that they want to use your VCS mechanism, that it's easy to do so and doesn't require plaintext diff-sane on disk format (if they wanted/were willing to do that they would already and git would be fine).
Perhaps some kind of CRDT (or similar) based collaboration/storage/version control service, with APIs such that you can have whatever proprietary format you want on top of it, but under the hood it handles sync, multi-user, merges, reversions, rebases, cherry-picks, diffs, etc.