[IshKebab]

> No need to add any extra feature.

Well that's the building blocks, but Git can do that through blob filters and whatnot. It's a necessary foundation but not a complete feature. You need ways of recording which blobs should be fetched eagerly, which should be fetched on demand, maybe a way to indicate where to get the data (you might want a central store for big files like LFS).

> you can work on partial repos natively

That's very good. Does it have anything like submodules or subtrees? I kind of think they are a bad idea in general but people do use them and they can be useful in very niche cases. From the sounds of the patch-based system I guess you could do subtrees quite elegantly? Can the patches be given a "base directory"?

I don't want to seem like all this stuff should be done immediately but it does feel like these are things that kind of need to be integrated from the start to work properly, unlike in Git where they've been tacked on badly.