Apple banning browser engines is what has prevented the web from becoming relevant on mobile, and the reason why browsers like Firefox cannot distinguish themselves from Safari and end up becoming irrelevant.
So no, it is not in anyway good for the browser landscape or the web, it only serves the interest of one company: Apple.
Look at some overall browser/os usage stats and say again that the web isn't relevant on mobile, and look at browser usage stats for desktop and android and claim again that firefox would have a relevant market share on ios if browser choice was free. Those claims seem pretty disconnected from reality.
So no, it is not in anyway good for the browser landscape or the web, it only serves the interest of one company: Apple.