I've been playing around with the fit and adjusting my road bike
I bought at Easter and have near dialed it in trying lots of things.
I'm pretty average build for 5'8" and bought a cheap bike for 5'6"
to 5'10". The bars on the bike I chopped and flipped into bullbars.
Seat height always adjusted near optimum extension.
Bars have steadily dropped on the front adjustment.
(Started flipped headtube in the top position of 3, now its not
flipped and two rings above and one below on the headset.)
1) My seat has ended up at zero of the +/- 2cm indicators
2) Elbow on the saddle end finger tip to bars is 7cm
3) The bars do obscure the front wheel axle, generally
I guess some of the old adages actually do work. But I only
found good seat height to be really important, the rest of
the stuff is more tweaking to suit you than being critical.