My Sage RPL Graphite III 5 wt. 7'6" balances great with my Allen Trout II #1. This balance point is right at the palm swell of the cork grip. I can sit the setup on my index finger at the palm swell. Very comfortable.
I have an old Bronson Royal reel from the 60's (made in USA) Basically a Pflueger knockoff , that balances perfectly with my Allen Myth 6'6" 3wt. Not sure where the sweet spot or fulcrum point is supposed to be. Feels right at the center of the cork grip where it swells. But I'm no expert.
Probably would only make a difference when fishing all day or for long periods. The better it balances, the easier it is to accomplishes the work it is required to do with the least ill effect on the caster.