Re:MDN (beta) is now built with React
by SquareWheel on Tuesday July 16, 2019 @02:31PM
(#20452639)
XMLHttpRequest was useful enough to become a standard browser feature. That doesn't prove that ECMA is somehow nonstandard, or even a poor standard. Or that frameworks built on top of it are.
Besides, today XHR is being replaced with the fetch API.
XMLHttpRequest used to be a popular ActiveX control, that introduced ability to programmatically perform web requests at programmer's discretion. Most modern Javascript frameworks can't be used without such ability.