Switch from one gas to another? Easy.
Go back to a dive? Easy.
Read it at depth? Easy.
AI? Sure, it would be nice to only look at one gauge and know what is going on.
"Easy" is in the eye of the beholder. To me, one button is easy: I hardly ever press it. I have no problem reading my puck at depth on a sunny Caribbean reef. And at night I just shine the torch at it.
Air integration typically implies your own regulator too.