Browser choice concerns a minuscule percentage of iOS users. I don't fit the consumer demographic Apple successfully targets (people like my parents, or kids). I write software and do system administration for a living. I have used Macs, iPads, and iPhones for years, and I don't experience "general crappiness" or "lack of control." Safari works fine for me, but I don't put much energy into organizing tabs or customizing home pages or stuff like that, which maybe Firefox or Chrome do "better" in some sense. I don't pile extensions into my browser. For using web pages Safari just works.

To paraphrase Steve Jobs, an alternate web browser would have to improve my experience 10x, not 10%. Having used all of the major browsers, for years, I can say that none of them do anything useful (for me) ten times better than any of the others.