Both the font size and colour scheme on that page hurt my eyes.
Sure, if you don't have a visual impairment. I do, and even though it's a very mild one, if one in 100 blog posts submitted to HN consider changing their colour scheme due to people complaining about it I would say it is worth it. And frequently I do see people changing their colour schemes based on HN feedback.
(depth of this thread and meta-meta-meta acknowledged and ceased)
body { background: white; color: black; line-height: 27px; }
#outer-wrapper { font-family: 'Lucida Grande'; font-size: 11pt; }