I don’t think that’s particularly important sometimes
It’s irrelevant these days. HDMI carries CEC, which feeds control codes between devices. Each manufacturer brands it up as something special (“Veira Link,” “Regza Link” et al) but it’s an interoperable standard.
The days of buggering about with entering four-digit codes after a Vulcan Nerve Pinch on your remote to control ‘foreign’ devices are long gone. On my system, all the remotes control all the devices; if the amp is on then “volume up / down” controls the amp volume, if I switch off the amp then it un-mutes the TV and all the remotes control the TV volume instead. It’s seamless, and the only configuration I had to do was make sure CEC was enabled.