Seems to be a standardized replacement for language specific app servers like fpm for php. I guess that makes it a little easier to deploy stuff, although recently with docker containers, that hasn't been such a big deal anymore. You can just take an off the shelf fpm container and deploy that.
Seems like a simple C app would take much less resources than a docker container and have a lot lower latency, though. How much computing power would you need for each, given the same number of users?