I don't quite understand why browser vendors haven't developed a terse, fluid API similar to jQuery/zepto with a touch of underscore/lodash and standardized on

I don't quite understand why browser vendors haven't developed a terse, fluid API similar to jQuery/zepto with a touch of underscore/lodash and standardized on it. Not only would this be easier to code to, but the JS runtime should have some opportunities optimizing chained function calls to the DOM. 10y after release, jQuery is an established pseudo-standard that is not going away any time soon. Even with querySelector/querySelectorAll/getElementsByTagName/getElementsByClassName, I am still using jQ as the vanillaJs API feels so clunky and verbose.