Bravo! CosmOS does look pretty nice. If I had better hardware, I might try something like that. Right now I'm using Fedora Server because of the SELinux, copilot, and podman support out of the box.
I've noticed that, too, about the community. I think part of the reason for the friendliness is a desire to see the community grow. Self-hosting feels very grassroots.

Too bad most of them have to wear swim shirts at the beach.