Huh...
So I guess Fingerboard Radius is right up there -- albeit just below -- Weight, in the list of Things I Never Knew I Was Supposed To Care About With My Basses.
Seriously, until I started frequenting TalkBass I had no idea what any of my basses weighed. But hang out here long enough, and eventually curiosity (read: peer pressure) got the best of me, and I bought a digital luggage scale, and now I finally know what my basses weigh. Not that the knowledge has any effect on which basses I prefer...
Likewise, other than the Warmoth guitar I recently cobbled together which I just happen to know -- because I had to specify it when I ordered the neck -- has a 10-16" compound radius, I have no idea what the fingerboard radius of any of my basses are.
How would I even measure that?
I do remember a professor at music college telling me that the Peavey T-40 I played in 1980 had a very flat fingerboard...but I have no recollection of that bass being noticeably different from any other bass I've owned over the subsequent 46 years.
Okay, yeah, the Chapman Stick I played in the late 80s definitely had a flat fingerboard! As did the classical guitar my girlfriend owned circa 1983.
But any of the other instruments? :::shrugs:::