I agree with the point being made: I would be really pissed if a desktop app had the window management buttons on a different corner, even the same corner but d

I agree with the point being made: I would be really pissed if a desktop app had the window management buttons on a different corner, even the same corner but different icons would feel bad. However, mobile apps are more like websites rather than desktop apps. The 'shell' has to be consistent with UI design and behaviour whereas the 'content' can have a UI relevant to function and maybe a different brand. For example, if you open gmail on Chromium and Safari, you'd expect it to behave and look the same on both.