I support. I would say maybe 5-7 tags would be a good amount.

u can put spaces in project tag just search on scratch “how to put spaces in project tags” and a million projects telling you how to do this will appear

Yeah, I support, because 3 tags is not close to enough for me. How about 6?

Neutral support.
I see how this could benefit others, but I think 3 tags is enough to just provide a general idea of what the project will contain. Perhaps 4 if that's really needed ^^