I'll assume Upvote = "Yeah, why not!" Downvote = "No! That's unnecessary."
Today I learned that our site's (serif) font Georgia was chosen by a designer (employed by SE), and the purpose of choosing a serif font over a sans-serif (e.g. Arial) was to "feature beautiful typography and invoke a vintage/warm feeling".
I understand that reasoning, and that most of our users are "linguists, etymologists, and (serious) English language enthusiasts", and that most users here are avid readers, and are therefore used to serif fonts that are believed to improve readability (at least for long passages).
While that is true, I feel like I agree more with nohat ♦ that "by adopting the proposed site style we run the risk of misleading new visitors that we are a bunch of obstinate old fuddy-duddies who reject anything newfangled and eschew modern approaches to linguistic questions". And I thought exactly that when I was new here, 4 years ago.
It is my understanding that sans-serif fonts appear more modern (at least to me), and that our relatively new sister site ELL uses it, and that our mobile apps do too. I don't know what (and why) other SE sites use serif fonts, though.
Should we change our fonts to look more modern?
N.B. This is not a feature request. This is not a recommendation for Arial. The site font does not really affect me personally, because I frequently tinker with CSS, and mix and match different fonts and themes for ELU. This is only out of curiosity. So vote. Vote up or down. Don't hesitate.