> it's the only way to structure UI for an application

No, it's not. Want consistency in all your text boxes/links/buttons? Are you going to copy/paste or inherit from a base button component or define the general common styles in one place and have the browser automatically apply them with 0 thought.

Need a button to be different - then do inline styles or more specific selector(incl. CSS in JS) or use !important.

As parent poster said, definitively stating there is only one true™ way to do something is the height of hubris.

> That's why it's been so frustrating for me waiting to see this paradigm come to web development

Inline styles were the norm for quite a long period of time...