Whether or not I can "see the hubs" depends on how much I flex my elbows and arms, and how much I lean my torso forward. I don't think the "see the hubs" test is very useful.

The ultimate test of "fit" for me is comfort. When I got my bikes set up right, I can ride as long as I want, and come back feeling better than when I started. No neck pain. No hand or wrist pain. No crotch pain. Finding that "best fit" involved a lot of "trial and error". The "fit" that works for me would not work for the guy next door. Each rider has to work it out for his or her own needs.