Well, at least for me, Safari is often still the fastest browser and has long been the best at power management (important when you're running on battery power)

Well, at least for me, Safari is often still the fastest browser and has long been the best at power management (important when you're running on battery power). And I like its UI a little more; its tabs, for instance, are native macOS tabs. Firefox and Chrome both make up their own stuff. As far as "least standards-compliant," I understand that when it comes to supporting progressive web apps, Safari has largely dropped the ball, but in day-to-day practice there just aren't many sites that I have trouble with on Safari. (The biggest one seems to be new Reddit, and I am not entirely convinced that issue is on Safari's end.)