He is giving his opinion, I don't know why people get so defensive if their own opinion differs. You quoted his post which said "inferior to buttons for me" the FOR ME part shows he is talking about just his own opinion, not stating it is fact.
Its not really a discussion when some just repeats dogma of an opinion of one and refused to consider other people opinions, or industry and safety studies and opinions.
Putting buttons on a touch screen is primarily a cost saving measure. But it requires the drive to take their eyes off of the screen, and controls to use it. That should be self explanatory and if its not, explaining it won't help. Saying "but voice controls" is an admission thats touch screens have severe limitations.
"... study funded by AAA found it took drivers up to 27 seconds to regain full attentiveness after giving their phone or car a voice command, and another study from the same group that year tested several then-current infotainment systems and found their voice recognition abilities to be highly inadequate...."
Its go nothing to do with EVs though as ICE have it too. Many manufactures are adding buttons back. Interesting a lot of Chinese cars seem to retain the buttons. Perhaps that because they aren't as pinched on costs as the western auto makers.