I may be mistaken but I recall reading several times that even though you can choose another app as the browser, all those apps are forced to use WebKit as the engine.
That’s correct, but the engine restriction doesn’t force people to use Safari and it’s possible to use either Chrome or Firefox front-ends. Apple wants to control the browser engine for a couple reasons:
- if you’re charitable: security.
- If you’re uncharitable: blocking the ability to undermine the App Store.
I know. I simply wanted to highlight the likely cause for parent's message downvotes, as none of the downvoters did it and things went quite sour in the sibling thread.