HN isn't really a commercial venture. It has some pretty significant benefits for YC, but pg's mostly opposed to trying to grow the site. In fact, he seems to more or less resent the growth that has happened due to the concomitant decline in overall quality.
Even if you were consider only the benefits YC gets from HN (exposure for YC companies, recruiting, and cachet), the benefits to the first from larger crowds are, I'd bet, offset by the slow dispersion of high-value members that has accompanied the drop in quality we've seen over the last couple years.
I'd be willing to bet that HN would probably serve YC's purposes better with 5,000 - 10,000 users than with 50,000 - 100,000.
I agree with you but I think doing things like eliminating table layout and having some sort of improved experience on mobile would not affect usership at all. You could keep the look and feel the same. There are profound technical issues with the site that affect everyone that could literally be addressed in an afternoon if anyone cared.
Even if you were consider only the benefits YC gets from HN (exposure for YC companies, recruiting, and cachet), the benefits to the first from larger crowds are, I'd bet, offset by the slow dispersion of high-value members that has accompanied the drop in quality we've seen over the last couple years.
I'd be willing to bet that HN would probably serve YC's purposes better with 5,000 - 10,000 users than with 50,000 - 100,000.