Apple could be much more open with iOS and at the same time be not less integrated. How does the whole AppStore policy make iOS more integrated? When I am crit

Apple could be much more open with iOS and at the same time be not less integrated. How does the whole AppStore policy make iOS more integrated? When I am criticizing Apple for iOS not being open I mean it is not open to run any application that works on the device. The Problem with iOS is that only Apple-Signed applications are allowed. Because of that, Apple has the power to keep the competition and the content they do not approve of out.