I don't see why DTMF https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_sign... couldn't

I don't see why DTMF https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_sign... couldn't have solved this pretty easily without adding too much complexity. I've seen those remotes before and they usually only had about three buttons on them. Still pointless, but I think this would have worked.