Again, the hostility is that users are forced to use the mobile app. Forcing someone to do something that is (granted for the sake of argument) a net positive that they do not believe is a net positive is user hostile.

The question is not whether mobile apps are good things. (Everyone is free to have their own opinion about that.) The question is whether or not it's a good thing to force someone who does not want to use your mobile app to use it for your own reasons / or for your own benefit.