Can't speak for the commenter, but I used to work for a team couple years ago that used rust and tokio extensively, and some projects were just not a good fit. At the time, futures were well fleshed out but the community hadn't caught up, so we were lacking a futures-compatible postgres and redis client. We wrote the redis client ourselves, and for the main project using rust that was sufficient. But for postgres, that was a show stopper for any other projects we were working on. So we ended up deciding between typescript and go for those.
Just curious, did you consider wrapping the existing sync clients with something like spawn_blocking[1]? If so, what tradeoffs did you find?