I would expect a Jedi Master to have multiple Force Dice committed to various effects and still be able to do some awesome things with the remaining Force Dice.
This is the key point. A master, Jedi or Sith, should be able to commit dice to countering enemy powers with Suppress, and powering up their own abilities with Enhance or Sense (something Yoda seems to do whenever he's in a fight) and still reliably get off impressive Force powers. I would never expect Yoda to go into battle without one die committed to Suppress and probably 2+ dice in Enhance (Agility and/or Brawn) with very powerful and reliable Force power still at his disposal--probably five dice left at least.
From my play experiences, you can still pull off a fair amount of things with just Force Rating 3, and I do agree with Tramp in this particular instance that in practical experience, getting a Force Rating above 5 is pretty much overkill, and doesn't really serve any truly useful purpose beyond ego-stroking.
There's a huge difference in power between a character who can roll 5 Force dice maximum and a character who can still roll 5 dice after already committing multiple dice to ongoing powers.
Edited by DaverWattra