Yoshi-P himself said the main class changes will come later (7.2-8.0). So I don't know what you mean about the class changes. Come back again in 2 years to judge the decisions. For now they are obviously on "stand by"and he explained that they focus first on fight designs.

Mobile app is not announced at all. Just a rumor. And Yoshida said multiple times he would like everyone to be able to play the game without having to rely on a specific device. That's also why we got an Xbox version. Although who knows if that mobile app will see the light of day...

And everything about the MSQ and the difficulty is all subjective. If they don't try to change things up a bit they get equally criticized.