Same as people often say about AI writing bespoke applications, these days... Libraries (like applications) often have 98% stuff you don't need, and 2% stuff you do. You can end up better off with your own thing.

I've always liked writing my own libraries and minimal frameworks for PHP, which seems to be a very unpopular opinion, but it almost entirely removes churn from your stack, which is nice for tools that may stick around for years or decades. I also never switched off jquery, preferring simple techs. I'm almost definitely operating at a smaller scale than most web developers here, though.