It does have a lot to do with the browser engine ban. It means that if someone else comes up with a much better browser engine than Safari’s, iPhone users cann

It does have a lot to do with the browser engine ban. It means that if someone else comes up with a much better browser engine than Safari’s, iPhone users cannot use it so Safari remains competitive even though it may have a browser engine that’s lacking, since others are forced to use Safari’s browser engine and not their much better engine.