Riiiight, I didn't realise you couldn't move servers (I'm new to the fediverse and have mostly used Mastodon). I suppose you could set up a new user and post using that and leave your other account alive; that way you're saving load on lemmy.ml and keeping your content available while using the new server for new things. Agree this fragmentation is not good though, and definitely Discord is not a helpful (and a closed) thing.
For me I dislike forums; I find them terribly frustrating in terms of extracting useful information - you have to read through pages of back and forth; people rarely summarise their findings wrt the initial post succinctly.
In terms of investment, I perhaps feel the opposite. I came here from Mastodon because I like the community-first approach rather than the individual-centred approach of mastodon. So I don't massively care if I have one account for chatting neovim and another for chatting life as a queer person or motorbikes or motorhead(!) - on mastodon I feel bad if I post about one or the other and think that my 'followers' won't be interested.
It's fascinating to see how social media is changing, and agree the fediverse in general has a long way to go, but I'm enjoying finding out what works!
Me. I use Slide for Android, an #openSource one (do we do hashtags here, can't recall!)