That's a complete non-sequitur. The complaint was that the owner of the device doesn't have the choice to install software that wasn't approved by Apple. The fact that you only want to install software approved by Apple is completely irrelevant to the question of whether you should be able to install whatever you want, because your ability to install whatever you want does not in any way affect your ability to only install software approved by Apple.
You only buying Nike shoes does not require that all other companies are banned from selling shoes, you only eating McDonald's burgers does not require all other restaurants to be closed, and you only buying software through Apple does not require that there is no other ways to install software either, that's just authoritarian bullshit.
You only buying Nike shoes does not require that all other companies are banned from selling shoes, you only eating McDonald's burgers does not require all other restaurants to be closed, and you only buying software through Apple does not require that there is no other ways to install software either, that's just authoritarian bullshit.