Personally, I think cross-platform support is more enticing at this stage. Especially since you could just drop the whole collection directory into a git-tracked folder, and have half of those features.

Also, how do you feel about others (i.e. me) making Collate-compatible software? Like, I'm really tempted to make a web-app for viewing/editing, or even just a vim/VScode plugin for that interface-integration.

Like I said, I'm really enthusiastic about the file format!