See this discussion. http://askubuntu.com/questions/281092/why-is-canonical-choosing-qt-over-gtk-for-unitys-next-generation http://askubuntu.com/questions/2810

See this discussion. http://askubuntu.com/questions/281092/why-is-canonical-choosing-qt-over-gtk-for-unitys-next-generation http://askubuntu.com/questions/281092/why-is-canonical-choos... And this answer http://askubuntu.com/a/315235 http://askubuntu.com/a/315235 "GTK+ does not support resolution independence, Modern mobile devices have ultra high pixel densities. If you run a GTK+ application on a mobile screen all the user interface elements would be so small as to be unusable. This has been an open bug on GTK+ since 2008 but they have not done anything about it." Read the entire answer. I am no expert to validate if it is correct or not.