You're an angry man. Or woman, I didn't bother looking, sorry.
You confuse critical with angry. When you're OMNI qualified, I can refer you to some actual examples of "angry" on OMNI/PR.
As for man, or woman, or AI, I refer you to the following cartoon:
There's nothing wrong with using 20" in F.
20", probably not (although a few of the tighter-pitched domestic F might be a challenge, due to the recline of the seat in front.)
27", you're pushing both width, and on regular recliner seats, height as well. Or you're going to be very hunched over... (and quite possibly running out of pitch, in some of the less generous domestic seats.)
I've since tried it if you care to read my thread correctly, to which by the way, I added a link to an article showing how big (small) the Tap 20 is in the London Underground.
Tried it in Y, or J/F?
Saw it. The humor of the latter seems to have gone right over your head.
NYC to Chicago in F? I try to fly with a carrier that provides power, but generally tend to fly further afar at any one time.
The 27" model (I misread, and thought it was the 20" I was looking at) quotes a battery life of two hours. The 20" quotes a battery life, only marginally better, of 2:45. Very limited by laptop standards, and utterly pathetic by tablet standards.
The example of NYC to Chicago was just an example of a roughly-two-hour flight.
As for power, it's nice if you can get it. Quite a few airlines don't provide it at all in Y (not that either of those are likely to fit any better than a full-size 14" or 15" laptop) or in very limited numbers of seats (as on AA.) Even where you're supposed to have it, my experience has been that while it usually works as advertised it's hardly 100% reliable (ignoring things like AA taking it down on entire aircraft types, which is unusual.)
What exactly is your problem with any of this?
Two threads on the same thing months ago, bumped the antique thread, and pushing a niche use case that very few others would be interested in.
That's a lot of work for a leg pull, and at the same time, I can't imagine what your interest is in boosting such an odd niche product.