You have to actively ignore the web's landscape in the past 5-6 years to state something like this.
Lately, major vendors (with Edge, that includes Microsoft) are agreeing on standards, developing them FAST, and the web moves forward faster than it has ever moved. Long gone are the days where your standards can get stopped for multiple years. And vendor prefixes are less prevalent now as features get implemented properly sooner.
I am yet to see the huge ecosystem for Web components that matches component libraries like those from DevExpress or ComponentOne.