I’ve been structuring my styles with CUBE.css (https://cube.fyi) for a few months now and a classless approach fits the composition piece very well.

Example: In a particular context (say the <h3> tag in the <header> of each <section>) I almost always want a default style. On changing that style, I don’t want to modify markup. In future, when adding more pages, I don’t want to remember the particular combination of css classes that I’ve used elsewhere. When a particular face out is different (this <article> is a modal) then I can add meaningful class names to convey intentions.

From a practical perspective, I’ve found it to give me 90% of the UI I want at 10% of the cost.