If you combine the CSS layout grids (or any other CSS) with web components you're effectively creating a reusable object, you can pass values to it programmatically or directly, you can even generate the entire WC programmatically.
Semantically, everything has more meaning and it's completely modular.
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I'm not sure. Does it mean that one day I won't have to write CSS the way I don't have to write machine code?
It depends, CSS isn't going away.
If you combine the CSS layout grids (or any other CSS) with web components you're effectively creating a reusable object, you can pass values to it programmatically or directly, you can even generate the entire WC programmatically.
Semantically, everything has more meaning and it's completely modular.