[NiLuJe]

I don't really have anything against Redis & Openresty, they (well, Openresty really) just happen to be slightly more invasive and involved to deploy than a standalone Rust or Go binary (or a Python web app) (especially if you can't/won't use Docker; and both apply here: I'd have to mangle my kernel & systemd configs to even be able to run Docker, while I can pretty much isolate a random binary in a much clearer fashion with a simple systemd unit).
And I'd have to mangle my already custom nginx & luajit ebuilds to just go native with OpenResty, as it isn't packaged in the main Portage tree. And, again, nginx configs.

(And, also, running a whole OS layer in a container, even a slim one, just to run a 5MB daemon doesn't really jive well with me ;p).