pdath:
So I guess if enough people are unhappy with the size you could copy Google (who I am sure have a whole team of usability researchers who study the tiniest of details like this one) and go with 13px.
I wouldn't be surprised if the final decision was one person's preference. Human behaviour being what it is, techs put in their preference or a manager/administrator wants to make a decision.
Some of you may remember the days before PCL5 (the 1980s) when the default LaserJet font sizes were all even point sizes. Whenever the even-numbers were questioned because, for example, 11pt was more useful than 10pt, we were told that the HP engineers preferred even numbers.





