We do actually have automated testing tools for that. https://bbc.github.io/wraith/ https://bbc.github.io/wraith/ is one: see the write-up https://responsivenew

We do actually have automated testing tools for that. https://bbc.github.io/wraith/ https://bbc.github.io/wraith/ is one: see the write-up https://responsivenews.co.uk/post/56884056177/wraith https://responsivenews.co.uk/post/56884056177/wraith or a contemporary interview https://source.opennews.org/articles/responsive-css-testing-made-simple-bbcs-wraith/ https://source.opennews.org/articles/responsive-css-testing-... . I get your overall point, though.