99% of web developers don't use React or Vue. That's just what's the hot and trendy media darling.
And to be frank, those developers using garbate like failwind or bootcrap ARE incompetent. Utterly and totally ignorant of the most basic rules of HTML and CSS, why either language exists, and who the audience for them is. Which is why they sit there crapping on the markup with presentational classes, dragging development practices back to the worst of HTML 3.2 '90's style. ALL of the claims of alleged "benefits" being nothing more than bald faced lies.
For proof of that, all you need to do is look at every single example on the official documentation for Tailwind! What a shit-show of ignorance, incompetence, and ineptitude!
But the majority of people believe a whole lot of bald faced lies. From the idiotic fairy tale about a genocidal sky wizard who "loves us" to the idea that an orange cheeto-fingered half-tweet is a "really stable genius", to the notion that tone deaf auto-tuned mumble-pop bimbo's like Eilish are talented musicians.
When in reality Eilish's grammy is a crime against music. Where the **** is Floor Jansen's grammy?
But what can one expect from a world where the comfortable lie is treated as truth, and anyone saying uncomfortable truths is shouted down by the mob.