But they're just actuated by radio signaling with some standard protocols, right? I mean, I don't have a garage and in this city probably never will, but my car still came from the factory garage-door controls built into the rear-view mirror. I assume it would take a bit of configuration to work with any given receiver, but I also infer it would work with most, otherwise they wouldn't have built it that way.

Is it hard to find an "IR blaster" equivalent for this kind of signaling? I'm just bewildered to understand why someone with the focus on self-hosted infrastructure that Home Assistant implies can still end up in a position where a third-party API restriction can pose a problem in controlling a locally installed device.