So it really is that simple: a small bash script, building locally, rsync'ing the changes, and restarting the service. It's just the bare essentials of a deployment. That's how I deploy in 10 seconds.
I'm strongly opposed to local builds on any semi-important or semi-complex production product or system.
Tagged CI release builds give you a lot of important guarantees involved in release concerns.
I'll take the fresh checkout and release build time cost for those consistency and versioned source state guarantees.