Whenever I want to use "vanilla JS" I use jQuery, because I find the DOM and various other JS APIs quite annoying to work with and jQuery makes things a lot smoother. There are some other, slightly smaller, libraries too, but they offer little advantages, are often unmaintained, and many people at least kind-of knows jQuery.
Bombastic absolute statements about "greybeards" being "out of touch" etc. is basically why I tend to avoid the JavaScript frontend community by the way, and also why I moved towards backend rather than frontend. I'm too old to deal with people who think there is One True Way™ to do things and that everyone who disagrees is a blubbering idiot (not that FE JS have a monopoly on this by any means, but it's far more common there).