You can read the generic complaints as "I don't want things to change at all. They were ok the way they were. I don't want to be forced to adapt to changes that I never asked for and that do not seem beneficial to me. I don't want to deal with this at all. I don't even want to think about it. I just want to use the app like I used to and carry on with my life."

Resistance to change is a major factor in the adoption of new technology and without some kind of change management, reactance will occur.