I don't really agree with the idea of all bikes having the same bar/seat/BB positions TiRed - unless they're all for the same purpose.
For example, a track bike has a single handle grip position and you are typically riding faster than on the road. You're also not going to be climbing any hills (other than the banking ). In addition, you're not usually going to ride for anywhere near as long as on the road. As such, a more aerodynamic position may be better even if it is a bit less comfortable or powerful.
And then transferring to mtbs - again different position (bars usually higher, shorter) so saddle/BB height may well need to be different given the interplay of muscles around your core and your legs.
Basically my point is that people love the idea that there is a simple formula (KOPs, 92%, bar&hub, elbow+finger, etc) that's right but there isn't and you can't even really apply a good position across bikes. You need to tune to suit. And work on yourself - eg flexibility. That's the bit people really forget about and it's not one that you can spend your way to.