There isn't a "typical" shape / size for a phone / tablet.
You can say an iPhone screen size when duplicated into 2 side by side does not equal an iPad screen size, landscape or portrait and I'd completely agree with you. But to say a new class of device won't have it's screen sizes and needs to conform to screen sizes of the past... that just doesn't make sense. No one conforms to screen sizes; past, present, or future.
Phones and tablets come in hundreds of different screen sizes. Ever see this map?
https://crossbrowsertesting.com/blog/mobile-devices/android-...
There isn't a "typical" shape / size for a phone / tablet.
You can say an iPhone screen size when duplicated into 2 side by side does not equal an iPad screen size, landscape or portrait and I'd completely agree with you. But to say a new class of device won't have it's screen sizes and needs to conform to screen sizes of the past... that just doesn't make sense. No one conforms to screen sizes; past, present, or future.