Are you absolutely certain that everything that jQuery does can now be done in a clear and concise way using plain Javascript? I've written some fairly complex jQuery selector over the years, perhaps I'm wrong but I something tells me that while the simple use cases can be done with plain old js the more complex selectors might not be so easy.

I find this debate so aggravating. I'm glad you can do some of the stuff jQuery does using modern vanilla js. Perhaps jQuery is overkill for doing one hide/show (or toggle) action on the page. But what about the more complex stuff. What is primary motivation behind this nagging issue, of the load time of jQuery?

I suspect it is that many developers have some obsession over shaving a few milliseconds on their load time. For jQuery? One library? Is it that bad that you need to write vanilla js? So you can save a few milliseconds?

Can you have a sophisticated selector for Event Delegation without using jQuery but make the code concise and easy to read? What about child selectors ("ul.thisClass > li.thatClass" > span.otherClass").

I like jQuery because the syntax makes sense, its clear and concise, you can do complex things with less code. Maybe some of the new stuff can be clean and concise and easy to read, but all of it? I have my doubts.