This is probably the new equivalent of #3321.

The redesign makes it hard to "Explore" stuff.

Whether that's intentional (because matrix.org is very slow and can't serve a Room Directory quickly enough) or not, I don't know.

I knew there was a Room Directory feature from before, and even with that knowledge, it still took me a few minutes to randomly stumble upon the "+" button next to "Rooms". Finding it was completely random, as I've clicked a similar "+" button before (next to People) and knowing that it just shows a textbox did not give me the impression that the "+" button next to "Rooms" would bring up something more interesting. I merely expected a text input.

Whether this is an issue or not, I can't decide yet.. It could be my prior conditioning..