There are 3 kinds of designers. Those who don’t design for the web (and better should start soon doing so), designers that write their own CSS. And designers that have programmers doing it for them.
In either case CSS is the main expression language for style, and just as efficient as building cars in a garage with screws and bolts as largest components.
The lecture presents Xierpa3 as Open Source proof of concept, showing that building for the web should be based on objects, which generate CSS and HTML. Instead of using the screws and bolts as storage for design. Xierpa is the ultimate solution for designers who want to regain control. But it comes with a price.