High degrees of stylability is a must for these UI components, so design trends should be moot, unless we're talking about technical design trends in which case

High degrees of stylability is a must for these UI components, so design trends should be moot, unless we're talking about technical design trends in which case I don't think web front end is going to see such crazy churn forever. It's already slowed down somewhat from what it was and I believe it's eventually going to hit something of a steady state. Plus even if there's some degree of persistent trendchasing in the web front end space, there's also those who always go for the old "boring" options when making choices of this nature, and better baked-in components would serve these devs well.