If Google or Mozilla release real versions of their browsers for iOS/iPadOS and offer long support for them, then I see it as a win. I've seen so many usable iPads turn into e-waste because Safari is out of date and can't be updated.
iOS Safari is the only thing that prevents a Chromium/Blink hegemony. A popular Chrome on iOS would be a return to the IE6 days (Firefox has such a minuscule market share, no one even notices it)