Well, you seem to only want to talk about size of tap targets.
Why do you think Apple decided 44 px was the right size?
They didn't choose it because it was impossible to touch and be precise enough to reach smaller tap target.
But the concentration, attention, precision, time needed to tap at first attempt too small areas affect usability.
Now, yes, in most cases, the 163 ppi screens and the 44 px iOS-wide norm makes in theory the 7.85" ok about that. But I consider a tablet and a phone are used differently, especially because of the size of their respective screen. Tell me, Why did they maintained the 44 px norm for the iPad? Because they already had the 7.85"@163ppi iPad in mind? Unlikely
For all the rest, I don't think it's useful to continue to talk about size more. We disagree on that.
And few screenshots can't really help to have a good idea.
And, again, my initial point was to say, inevitably apps would change if a 7.85" iPad was launched with only the solution of scaled apps. Devs would have to adapt to the new size their app render on this screen. And I think it could lead to deteriorate the experience of app on the 9.7" iPad.
I was not talking about the un-feasibility and heresy a 7.85" could be. That was not my point.