Among other issues, any process running as `nobody` can ptrace (debug) another process running as `nobody`. Arch enables ptrace_scope by default now, but it can't be relied upon because it's commonly disabled for compatibility or to attach debuggers to your own processes without root access.

It's better to have 2 services running as nobody than both running as root, but it's unnecessary to leave services vulnerable to each other like this. Using nobody rather than root is better in the case where the service is exploited, but it makes the service itself more vulnerable.