Tiny screen? Tiny buttons. Tiny text.
Big screen? Big buttons. Big text.
That's a really stupid design concept.
Ideally, on touchscreen devices:
- The right size for buttons is about the size of my finger (Which is fairly constant for most humans)
- The right location for buttons is where my finger can reach it easily. (Again, fairly constant for most humans)
- The right size for text is so it's readable. (That can be quite variable for many humans, and also depend on screen resolution and technology)
If I have a bigger screen, I want to display more information, rather than display the same amount of information in a bigger text.
Also if the designer is really dumb and scale everything to full screen, then aspect ratio is messed up and the pictures look weird
Web sites are sometime hard to use on phones because it's hard to click on links, which are buttons the same size as text. My eyes have better definition than my finger. Phone apps that are not optimized for tablets are wasting the tablet potential.
Running an phone app on a desktop machine is usually a terrible experience.
Apple didnt solve that problem any more than Android, they just have less of it. But they do have that same problem for iPad vs iPad mini. Some apps are harder to use on mini because buttons and texts were sized for the big ipads.
Websites can usually achieve useful compromises.