Sass makes it a lot nicer to write BEM notation. The long class names used to bother me too, but it is actually much nicer than not knowing where a class came from. Is `.right-button` a global button style, or unique to this component?
I agree that sass enables nice readable BEM, but I don't really think that BEM makes markup any easier to read than something like tailwind.
If you're into knowing where your class came from, it seems tailwind would be even better for you because now you have access directly to your styles right there in your markup. Skip the class step altogether!