I'm not sure why downvoting is needed. What's said is true: on the web we already have to deal with different browsers and versions. It should be a fact of life

I'm not sure why downvoting is needed. What's said is true: on the web we already have to deal with different browsers and versions. It should be a fact of life for web developers. And things today are still infinitely better than back in the IE 6 days: many modern features work on all major targets. Why do people insist so much on engine consistency for "desktop web apps"?