Is anybody in the HN crowd still using jQuery for new projects? If yes, why not use "vanilla" js?
So far every new project in the last few years ended up using jQuery because there is always this one ui widget that does what we need and the other libraries just aren't there yet and its not worth the hassle of reimplementing or extending a different library just to not use jQuery.
There are stuff like : File picker [2], dropdown [3], tip [4] for tooltips and many more.
1 : https://github.com/component
2 : https://github.com/component/file-picker