I have the same thought. Bootstrap is still my favorite choice.
I wanted to like Tailwind, but it seems a bit disingenuous. It's like using inline style tags, just with shorter names.
From time to time I've made an effort to learn how CSS works, but after a while I forget the details. It's more productive if I can browse a catalogue of visual examples, with concise markup that is easy to copy and paste.
Bulma seems like the more "modern" take on Bootstrap: https://bulma.io/