Unfortunately, even proficient developers are having trouble due to some misguided technical choices those websites are making: https://twitter.com/sindresorhus/status/900005504931438593
The Web is a medium with built-in customizability.
This "our product is perfect and must be used as is" attitude reminds me of a relatively recent example that seems to be dying down: mobile websites that used the `maximum-scale=1 ` value in `<meta name="viewport"`. This disabled zooming in mobile devices. This was an accessibility issue that affected people who otherwise don't encounter other accessibility issues.
If it were simply a matter of providing the smallest payload to clients, these sites could provide some sort of external manifest/source map mapping human-readable class names to hashes.
Let's stop using divs for presentation whilst we're at it and spend man-years on picking the right semantically named elements with no benefit to anyone anywhere ever.
No ajax or js either, I'm pretty sure they didn't envisage that.
Edit: I now realize that, taken out of context, my comment sounds pretty twisted.
Edit: read the FAQ, downvotes are not for disagreement.
Commenting about downvotes in arguments isn't ok, though: https://news.ycombinator.com/newsguidelines.html.