People use ultrawide screen, with half screen dedicated to browser, half screen for code editor, and two columns open in editor. This is very modern setup, and 80 is perfect for it. Don't limit your thinking to your own setup.

I think discussion on the perfect limit on public forum is non-sense. It might be slightly less non-sense to discuss it with your team, but even that I think it is bike-shredding most of the time, unless the entire team for some reason (like they share the same equipment setup and happen to have same preference) overwhelmingly share the sentiment.