You can get an extension/userstyle for your browser so that code blocks will not bother you anymore.
For instance:
https://play.google.com/store/apps/details?id=io.github.hidr...
And plenty of others.
The 'people behind HN' are fewer in number than you would likely guess and are working hard to keep the community on the rails, on top of being responsible for the development. It is not as though they are drowning in capacity.
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.