Programming is mostly creating functions and interfaces to decompose problems into reusable parts where reuse makes sense. Nothing wrong with creating a simple function for making XMLHttpRequests or for fetch API. Most of the time there's no need for the level of generality of jQuery interfaces.

Just by making a function you're not creating a library. Sometimes I find DOM API verbose too. Nevertheless the fix does not need to be a interface like jQuery to completely hide DOM API under another interface. It may be enough to extend the HTMLElement prototype a bit or write a function to "compress" the code a bit and make it more readable.