So obviously caters to what the web once was and should have stayed, not to the metastasizing idiocy it has become.

I'm ancient enough to remember when mainstream browsers came in packages of a few megabytes and got us through the day just fine with a featureset less than (or at the very most equal to) the current state of NetSurf. In a somewhat more rational world there would be massive popular pressure for this to remain the case.

Yes, sites break in NetSurf. This is squarely their own fault for not providing civilized degradation. Although it certainly wouldn't go amiss if the NetSurf engine encorporated the worthwhile elements of CSS 3, basically meaning Grid and possibly Flexbox.