Don't bring a knife to a gunfight. If you want to object to websites that allow codeblocks don't visit those websites, and if you do bring inferior devices to read with then don't complain.

HN is one of the most readable websites out there as of today and the degree of bitching about details such as these is infuriating, just look at the ad plastered animated bs you see elsewhere and then realize how trivial this particular gripe is.

Rendering is mostly a client side affair, you have all the control you need to make it look any way you want.