Too late, http://youmightnotneedjquery.com/
The first three examples, which are probably the worst, improve greatly in more modern browsers that include the fetch() API.
In my view even the jQuery examples look a lot better if you can write ES6.
I ran into this issue of jquery silently failing a while ago and will always remember that pain point
If you're developing a user-facing app, then yeah, jQuery is still pretty darn helpful.
The site suggests you try not to make it a dependency if you're writing a JavaScript library. I also suggest vanilla JavaScript for simple pages that need just a smattering of interactivity.