On iPhone you are using WebKit no matter what browser you use. Unfortunately it is the same deal with Firefox too. In addition, Apple isn't forgiving when it comes to their customers privacy and security. They actually "sell" this comfort in their adverts. So it would be crazy if they pulled their windows and Android tricks on Apple.
I had to use a chrome based browser on Android for a couple of weeks since Firefox had a problem. It was like a nightmare. It is common in IT history that worse quality product wins.
Think about MS-DOS. Microsoft also sold Xenix,a UNIX system that time.
In the apps introduction screen, it says it will soon integrate to Fediverse. I believe people are afraid from another, much worse "eternal September" happening. It happened to Usenet. https://en.wikipedia.org/wiki/Eternal_September
Business issue or hardware? If it is hardware there is always help, e.g. high level kernel devs cared about my HP boot issue or NetBSD.