Programming.dev is still running Lemmy 0.19.5, and they had a quite severe issue of database corruption for 3 months. Thankfully, it's solved since (https://programming.dev/post/20515601)
I hope this meme will help at least limit it down to 2 or 3 communities. Having 7 for the same topic is too much. People want to post and comment in a place active enough, not crossposting everything to 7 communities.
I've been thinking that there should be a better shorthand for linking to a community on a specific instances. Something along the lines of giving each instance a shorthand up to 4 characters or something, and then do community links in the format /<shorthand>/<name>. So give sh.itjust.works sjw as a shorthand, and /sjw/privacy becomes the community name. I think that would make it easier to remember the one you mean.
Don't think you're going to see that in every mobile client...Sync doesn't have it for example. I think the benefit is more in remembering than typing, too.