Granted the asset browser is not the shiniest addition to 3.0 but it's definitely shaping up to be really nice in 3.1, and I predict a bunch of questions arising in the few coming months.
There is a tag for pretty much every single editor so I don't see why we couldn't add this one. I know I can go ahead and create it myself but I wanted to test the waters before doing so.
There is an
asset tag but I feel it's not generic enough for the asset browser, since it also involves managing catalogs, libraries, etc.