The name thing doesn’t seem that complicated. I already know that !memes are gonna be lefty memes, and the memes at !memes will be generic, and so on.
There are some where it’s less distinct. Technology@lemmy.world and technlogy@beehaw.org are not so easily differentiated, but at the moment they have totally different content on their frontpages, so I have no complaints. Over time, I expect both to evolve, most likely in different ways.
I think the search problem will get resolved over time. Currently, search is very rudimentary, and barely useful for finding new communities. As it becomes better and cataloging communities it can also become better at downranking or excluding communities below a certain activity level.