Do you think there would be similar frustration points in the Mastodon to Lemmy process? Obviously, I am ok with both so this may be a major blindspot of mine, but I suspect that may be a slightly easier transition.
Also those aren't weird names for tags they are more like existing communities. Because Mastodon does not have native groups there are several implementations like https://a.gup.pe to fill the gap. Following tags like that is a similar way to go about it. They are distinct from #books or #horror. #monsterdon in particular is a weekly monster movie watch party. The point is that these are active communities with a lot of crossover potential.
I think this may not have enough total posts to impact a feed like it needs to. Would definitely be a useful feature tho