I agree about the aspect ratio but you have cropped a lot of pixels in your calculation. Horizontal is 2732 not 2372.
So just to correct your numbers, vertical would be 1536 pixels. So it is still more than 1440p. But as I said earlier, Netflix, to my knowledge have nothing inbetween HD and UHD as a service offering and it is better to start with too much and scale down than start with too little and scale up as has been shown many times with TVs like the Panasonic ED plasmas.
so the first point you said, netflix doesnt offer anything inbetween HD an UHD, so they should provide 4k to your ipad?
this doesnt make any sense. if you are the business owner, if you really want to offer "higher quality" video to ipad pro users, would you rather pay a lot more for bandwidth to push 4k that they just simply can't benefit from it, or just offer 1440p videos to everyone? remember netflix is paying for every bit it pushes out.
the second point 'it's better to start with more'. it seems to be 'true', but it is not. it is not the same case as your Panasonic.
so first, i remember reading 4k --> 1080p has 'better' quality than plain 1080p, becasue when shooting videos, not all 1080p (whatever the hell million pixels there are) have all RGB colors, but if downscale 4k-->1080p, then every pixel has all three RGB color data, therefore the picture quality is better (the improvement only lies in color, sharpness is sololy determined by resolution).
but the difference is, first networt streaming usually dont provide such high quality (color-wise) pictures, because it simply takes too much bandwidth. a bluray quality movie usually take >30gb, that's not even 4k yet. and second, even if your network is capable to receive such high bandwidth high quality streaming, there is no difference whether the downscale happens on your device, or on netflix server. that is say, for a 4k original movie, downscaling it to 1080p on netflix server and push out as 1080p will provide exactly the same quality as downscaling on your ipad while pushing out as 4k (provided they use same decoder or whatever, but the fact is, their server has more power and is usually better). so you still wont see the benefit you saw on your panasoic. and 1440p is just more effective