Yup, hard truths: vanilla JS is far less readable and clunkier than just using jQuery to do the same thing. Also, not everyone needs or wants to move to a shadow DOM framework with a zillion components and high complexity. If you're building a SPA or PWA, yes, absolutely, but for the vast majority of us who use a traditional backend/CMS-driven site with server-side rendering where client-side interactivity is needed, jQuery still does the job really nicely.

Now I might not know what I'm missing out on since I haven't worked in any projects w/ jQuery as I haven't been developing websites for a long time (and the type of sites I make probably also influences the stack), but there's probably something that does what you want as elegantly without jQuery.

We have stuff like querySelector and toggle in vanilla JS that makes it possible to change state simply, async stuff is much easier to understand than callbacks, and there are ways to split your code into components without using shadow or virtual DOM (see: raw web components, shadowdomless Lit, Svelte, etc). I've never found myself longing for something like jQuery.

If you're creating a fully interactive webapp (google maps, docs, or apple music), go with one of the frontend frameworks because they will give you a much simpler way of managing states and binding it to the view layer. But the majority of websites are not apps or shouldn't be. You'd only have a couple of interactive elements if you strip the UX to its core. And that can be done easily with server rendered templates and a bit of jquery/vanilla js.

I'm not saying jQuery isn't great, but being entrenched and being great are two different things. It's not really saying anything to say things would break if you remove it.

The thing is for a certain time, jQuery was almost seen as inseparable from JS itself. Like the Python standard library is to Python. You can still find StackOverflow questions today asking to do something in JS and the answer is jQuery, and not just "here's how to do it in jQuery", just "here's what you asked for". That means it certainly got used in a lot of places where it wasn't really necessary.

The backlash against it, though, is just your typical pendulum swing that seems so much an unfortunate part of human nature. It's like when CSS was in and table-based layouts were out. I saw developers trying to use CSS to render tables. Nuance is hard and people can't help going to extremes. jQuery is probably still a really useful tool. I've seen some jQuery expressions that are far more elegant and beautiful then a plain JS equivalent. Whether this matters for any particular project is completely up to you. I don't like the way it encourages tons of ad hoc JS snippets all over the place, but that's a fault of developers, not jQuery.