I honestly feel if the two paradigms did a little bit of effort on interoperation, we could figure this out. But all sides of this atm are like "the other side is doing it wrong" and refusing to look at this.

Iirc. you'll see comments towards the OP only (i.e. root comments, and replies to the OP explicitly). You will also not see comments non-OP microbloggers will send towards threadiverse users on other instances than where the community is in.

The threadiverse feels as active as usual imho. We still can't really attract non-early adopters (i.e. privacy and FOSS enthusiasts), but the next reddit exodus is inevitable at some point.