Comment This app is best viewed in ... (Score 4, Interesting) 171
The Metro APIs were designed for web front-end programmers, not people who write for real GUI toolkits. You can build quite competent Metro apps in HTML and Javascript, and if you reach any limits, your web shop could hire a third party to write a module in C# or C++ to work around it.
The API for web programmers includes also rules that that apps should be made for a finite set of fixed screen sizes. Not resolutions -- screen sizes. Metro was never designed to be scalable.
This is not only a Windows problem, though. MacOS X on Retina(tm) displays is just as bad, but there the OS draws everything twice as big to begin with and scales down if needed when compositing windows. Apple never cared about hinting anyway, so all controls and labels are just as fuzzy scaled to 125% as always.