You say no VMs and are using Apple hardware. Are you running this all directly on macOS?

Yes, except for one HAProxy server. The setup I described isn't fully in production yet, but my testing confirms it works. We've been running for years on one single baremetal server on Hetzner/OVH though. And macOS makes sense for one of our main workloads (headless browser agents). Much better than browser-in-linux-docker for many reasons.