Honestly, I can see why some people find it annoying but in my experience so far it's been fine. Do a sweep on lemmyverse, sub to all the communities around a given topic, never really think about which one it actually came from when I see a post in my feed.
There are some quite niche topics that have been unnecessarily split, essentially just because people want to be in charge rather than joining forces, but that's people for you and railing about it isn't gonna get us anywhere. From an end-user pov, subscribing to multiple has been fine.