because digital assets have a fundamental difference with material ones.

I'm referring to how digital assets can be owned non-exclusively, i.e. we can both have the same data.

In contrast material (or physical) assets are exclusive. Either I have it xOR you do, we cannot both own the same thing.

Stocks (and other sophisticated goods) are interesting because they mean we each own a fraction of something, even when that object cannot actually be easily split. But notice how there's still a sense of exclusivity; the same stock cannot be owned by multiple people at the same time.