I don't necessarily disagree, but I'd like to reassess where we are in terms of performance once Typed CSSOM is widely used. Using Typed CSSOM to adjust the "style" properties of individual elements is awfully close to doing what you describe: the difference is that matching and cascading still happens, but the semantics become much simpler if you're adjusting individual styles, and it's not clear to me that most of the overhead can't just be optimized away at that point.