You make interesting points. For me, as a back-end developer, the prevalence of Bootstrap is a major con because I can't (due to lack of knowledge or confidence, I'm not sure) make a Bootstrap site look like anything other than a Bootstrap site with different colors. Tailwind is the first front-end framework that successfully got me away from that and helped me execute own unique design vision. What seems to come to you easily is a complete struggle for me.
Don't disagree with this at all. Bootstrap, like Tailwind, is a tool and after I purchased a cordless drill I didn't go around telling everybody I know to throw out their manual screwdrivers because the revolution has arrived. It seems to me that's what people perceive is happening here.
In my (limited) experience when I'm repeating the same set of classes over and over again I extract to a named component; You shouldn't have 700 identical buttons that all specify the classes that compose their look. 5-7 times = a use pattern and time to extract it.
