We're enjoying Cohost so far but the main thing Tumblr has going for itself still is the sense of community. Even if posts blowing up or having quite a few followers can be annoying, it's better than feeling like I'm yelling into a void.
I suppose what I'm trying to say is that I'm not sure we'll end up switching to this as our primary social media unless Tumblr goes down completely. I can't see us getting used to being unable to see when someone answers our ask or to tag someone in a post.
We will, however, be "abusing" the ability for side-pages to be essentially completely separate from our main, I think.