Automatic recording may be illegal in jurisdictions that mandate permission from both parties. I can see why gos might not want to include it in a base operating system.
We never said we wouldn't implement it. We said the current pull request is inadequate because it doesn't show users that it's enabled so people can end up accidentally recording a bunch of calls if they toggle it on and forget about it or toggle it by accident.
Samsung phones have it. I have verified from at least one source who lives in one of such jurisdictions (India), a Samsung phone they bought has this feature. So, it doesn't have anything to do with the law.
https://en.wikipedia.org/wiki/Telephone_call_recording_laws