Comment by gf000

It has nothing to do with education, software development is not learnt in a centralized way so you could hardly claim anything based on that.

Cascading simply fails to scale/work with web applications, especially when multiple people work in parallel.

HTML both describes content AND layout, so you simply can't separate the two. This was a nice dream when the internet was "markdown encoded in html", but the moment you write a nested <div> for layout purposes you lost. So HTML has to be written together with CSS, so we get no separation. Now what is it that you could meaningfully cascade? (If anything, variables are all that we needed)

Add to it that people are using third-party components as well, and now many "widgets" starts by resetting outside styling rules.