it's per publisher, company accounts can have multiple developers, a bit misleading there, and it's not even needed for mac apps, just for publishing and distributing notarized apps or through the app store
the article displays a couple of screenshots on why it's a poor experience, bottom navigation is to small and the back button is behind the camera, it's very unlikely to be fixed at the component level so devs end fixing these issues themselves by creating a new component that may not behave entirely as the system one, using the device's safe area
not their computers, also Apple usually pushes changes forward, not backwards, in this case using lightning they just diverged from micro USB, and probably now most people have USB-C chargers