Why not supply async api in mongo C driver?

Hello, just bumping this thread again. Are there some news here? Really surprised that the C driver has no async feature. Still nothing planned in a near future? As has been mentioned earlier, in a high concurrency context like can be for some web services, async model usually performs a lot better than managing a high number of threads. I would be worried to begin my developments with a sync model…
@kuku_super @marty1885 do you have any feedback that you can share when using sync model with threads?
Thanks a lot!