> I did not say it was nonsense. I said it is not objective.
Wow! If it is subjective, it is automatically nonsense. Otherwise, why should anyone follow design guidelines that someone found nice for himself only?
> You can define e.g. 10pt and measure such a rule objectively, but rule itself ("10pt") was still based on something subjective.
Surely, you have to be kidding. You obviously do not think that it is possible to measure at which font size majority of people can easily read the text, at which size majority of people can comfortably hit a button with their finger etc.
> Note that GNOME is not very usable on a tablet. I suggest trying it before suggesting that it is a tablet interface.
I did not claim Gnome was usable on a tablet. Only that Gnome developers insist on making my desktop behave like a tablet/phone. Which is unnecessary, because my desktop is neither of those.
PS. You have just reduced decades of usability research to nothing more than someone's whim.