You probably need to start thinking about resolution in a different way.
In the past operating systems effectively assumed a fixed number of PPI (Pixels Per Inch). Add more pixels and you add more screen real estate. Make those pixels physically smaller or larger and what can be seen gets smaller or larger. There were some adjustments for changing PPI but at least with windows they messed things up with for example menu text not lining up properly.
Now take a modern Android tablet. The question is what physical size should the UI elements, icons, text etc be to provide the best experience.
On a 10" screen everything should physically be the same size regardless of whether the screen is 2560x1600 or 1280x800. The difference is on the higher res panel a given icon or letter can have 4 times as many pixels devoted to making it look pretty/sharp.