The dominance of non-relevance is interesting for HN. Was writing exact the same thing, and just saw yours.
In this and some other technical topics, people end up discussing their personal tastes with web site's design, their individual UI frustrations with some button on the web site, the font, the color, and other random non-relevant topic; like now the profitability.
It's no excuse, but I see a reason for this: most people feel they understand these irrelevant topics better than they understand the scalability features of the infrastructure Reddit has built. People talk about their comfort zone.