Well there is more than one way of checking geometry. The way that 01_250 seems to be refering to is crunching the numbers, which is fine if you can relate those numbers to actual handling traits.
The other way is to ride the bike, and see how it "feels"; after all, the reason that we care about geometry is because it affects the way the bike feels.
Soooooo, all those people who said "no, I don't check, I just test ride it" you ARE in fact checking the geometry, just in a different manner to those who look at the figures.