I can definitely see a system like this leading to problems.

"I want a gold medal, AST buff me more!!!"

"Hey! Switch to me for dance partner! I just need a few more gold..."

"I DON'T CARE I'M TANKING, DRAGOON GIVE ME YOUR TETHER!"

And the inevitable PF's for farming medals would undermine much of what the system would be trying to accomplish.

Also, if you could get medals from EX content they would quickly become worthless while people farmed the weapons/mounts.


But it's a moot issue.
Yoshi P. has said they'd never add anything in game that rates/ranks your performance.