Having worked with it for 20+ years I've just been left convinced that the biggest mistake frontend dev has made in that time is to pretend that CSS is a langua

Having worked with it for 20+ years I've just been left convinced that the biggest mistake frontend dev has made in that time is to pretend that CSS is a language that should be 'engineered' instead of a design flavour that should be build up / torn down lightly on demand. It's esoteric corners should have been fixed and simplified so designers could learn and explore design through markup as needed, rather than double-downed on to where we are now.