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.
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.