Your "why" is idiotic dude. Do people deciding between IM and Peds do a PSF? Do people contemplating derm vs ortho do a PSF?? No...NO. they dont, because the concept is friggin ******ed. First off, a PSF will give you no more insight into what being a RL pathologist is all about anymore than a month or two rotation. To counter all the people who think its a great way to look good on paper, there are FAR better ways: do a year of research in some aspect of Path that you like, better yet do a MD-MS or MD with thesis program if your school has that, there are tons of programs when I was med student like the NIH Cloister Program (dunno if it still exists) as well as HHMI grants for this stuff. And this research could be applicable to both a career in rads or path down the line. IMO, the UCSF PSF is specifically for people who want to go there for residency to the exclusion of all other places, and honestly the place is good but aint worth a year of your life. A year is long time whether you are 1 or 100 years old.
-Peace
PS- The original intent of the PSF was to generate interest in path when the field was failing to attract AMGs and was designed to count as a year of credit for people who didnt want to do a prelim year/credential year when such things existed, now they dont, hence the biggest reasons for the PSF are gone....