igortyhon I think you misunderstood my question. I'm not asking about the aspect ratio. There are thousands of different screens with different aspect ratios, so this metric can't be used to estimate the physical size of the screen.
In my above example, the aspect ratio for both screens is 16:9, but 15" screen is about 600% larger than 6" screen.
But the aspect ratio is what really matters for display on mobile devices.
For example Android. I researched the most massive displays of my android players and made 3 groups for myself.
--HD group.
If you have HD ratio, what do you care if it's 1920*1080 or 1280*720 or 854*480. And you do not care how many pixels per inch, the device itself will scale, the main thing that the ratio is observed and nothing is lost from the view.
--Group with long screen.
--The tablet group
It's very convenient to check it all in Google Chrome. You can create the most popular device resolutions. That's enough for me to check for Android and iOS.
I have read and tried to apply what the developers wrote in the article two years ago, but it all breaks down in practice and turns into manure. Aspect ratio is the only thing that has never failed.