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Components are a designer’s bread and butter. Designers have been building design systems with some model of “component” for a really long time. As the web has matured, from Atomic Design to Sketch Symbols, “components” (in some form or another) have asserted themselves as a best practice for web designers ...
Designers don’t care about selectors or #TheCascade. They might make use of it since it’s available, but #TheCascade never comes up in the design thought process.