I don't see that as a benefit tbh - if I have a dependency, I want to see why it's there as part of the commit. I'm imagining running blame on Cargo.toml and seeing "Add feature x" vs "Add dependency". I guess the idea is it's "➕ Add dep y for feature x" but I'd still rather be able to see the related code in the same commit instead of having to find the useful commit in the log.

I suppose you could squash them together later, but then why bother splitting it out in the first place?

I see that some use a subset of Gitmoji and that does make sense to me - after all, you wouldn't use all of them in every project anyway, e.g. 🏷️ types is only relevant for a few languages.