Yes I agree - it's nice to be able to see exactly what's happening without needing to dive into a rats nest of fragile CSS cascades.
I strongly prefer "button is-primary is-fullwidth" over the long list of tailwind classes.
Also, have you ever tried to update old designs using tailwind? It's a disaster. Far easier to know what styles the ugly bem card class you mentioned apply to, rather than an arbitrary b-2 m-1