I adore Dreamwidth, because I am not online for the kind of low-key interaction that you've outlined (likes, reblogs, tag meta): I want to actually have conversations, and see those conversations unfold in a coherent, threaded manner where all strands are collected in a single place, you know? But for people who found that more involved kind of interaction really stressful, draining, or difficult, I can see that Tumblr offered a way to be a part of the community, without having to write essays in the form of posts, and keep up with a lively comment section.

Like you, therefore, I resented that fandom moved to Tumblr, because it didn't suit my needs at all, but I can see that for some people it was ideal and they really found a home there (and if it was their first fannish platform, it's going to seem like the standard). I'm really happy everyone's back here on Dreamwidth for now, but I'm not holding my breath that this state of affairs will be permanent. But of course, there are the people — like you, like me — who never left, but have just been quietly doing our own thing here on Dreamwidth, and I can't see that changing. For me, as long as the people who've always been here remain here, active and posting, that's enough.