Careful posting systemd satire here, there is a high likelihood that your comment becomes the reason this feature gets built and PRed by someone bored enough to also read HN comment section.
You know, Tailscale serve basically does this right now, but if I could skip this step and let systemd expose a local socket via HTTPS, automatically attempting to request a certificate for the hostname, with optional configuration in the socket unit file… I would kinda like that actually
You can basically implement this right now already by using a systemd generator. It’s not even a particularly bad idea, kinda want to try doing it to hook it up to nginx or something, would make adding a reverse proxy route as simple as adding a unit file, and you could depend on it from other units.