[lelandfe]

Between ITCSS, SMACSS, BEM, and all the other CSS naming and structural conventions, it's been pretty nice to do CSS-in-JS and not really worry about the cascade.

[toastal]

Except not all sites need or should really use JS

[ponyous]

You can use CSS in JS on server side only, and serve it as a normal html + css site to a browser.