The one reason not to use jQuery is that nobody is learning this library anymore so you're creating an outdated code that fewer and fewer people will be able to understand. But if you're the only one that will be ever interacting with the code it's fine.
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I don't know why some people get mad when ohter people use jQuery today. For me jQuery is just JS with simplified API.
Maybe if jQuery team redesign thier website and add API to manage custom element, it could be a game changer for them :D.
The one reason not to use jQuery is that nobody is learning this library anymore so you're creating an outdated code that fewer and fewer people will be able to understand. But if you're the only one that will be ever interacting with the code it's fine.