I agree these two would bring obsidian to a whole new level.
I also used Zettlr for a while, the easy way to use pandoc to convert documents was amazing, and being able to use it together with something like Zotero would be a huge advantage in Obsidian.
It’s only this point that I don’t get:
It’s already possible to make sub-folders in obsidian
Overall you are completly right, these would make obsidian even more amazing!