If you use any app other than what Apple provides, you become a second class citizen on your own phone.

Third party apps simply don't integrate with iOS nicely unless Apple allows it. Even though you can choose a web browser, it has to use Safari's underlying code base.

I'm on a Pixel 7. A lot of people say it's like Google's iPhone, but I can use Firefox as my browser natively. Adblocking actually works, too. I can choose any app as a default for whatever. Lots of FOSS! Google doesn't own my Pixel the same way Apple owns the iPhone.