Earlier quoted context omitted.
It is very reasonable gatekeeping. People would be inundated with notifications on their phones.
No: you would--at worst--be asked more often than you would like to approve notifications for random websites, all of which you would click no on; this feature doesn't just magically cause notifications... hell: it already even exists on desktop Safari and I just click "no".
Also websites have realized that I am going to click No in the browser, so now they popup first asking if I want to allow push notifications in JavaScript so when I click no, they can ask me again later, vs if they popped up the browser and got a "No" there they could never ask me again.