This may look like a nerdy nitpick when it is positioned as discussion of subdomains. However, the lack of a widely accepted split-domain solution also makes it impossible to implement an ActivityPub endpoint which would use user handles matching their email addresses (email works by MX records, missing from ActivityPub and WebFinger), as well as hosting multiple domains on one server.

@takahe tried this. It exposes a lot of issues in other servers.

@julian @canary