Yeah... I'm an engineer (a bit OCD too but who isn't these days?) and perfectly okay with change. I enjoy it rather... but I definitely prefer HN's current look over the OP's. The current font size is perfect as it is. I feel like larger fonts make sites look less professional... can't quite put my finger on why though. Maybe it's because larger fonts require more scrolling and is less efficient when I can read 12px (or even 11px) font without squinting just fine. There may also be a correlation (at least for me) with large fonts and say... children's books/sites and those with poor vision (typically the older generations who are mostly computer illiterate)... i.e., less professional and more casual.