And if a Lord is happy with his region being at 90%, why should the Banker care?
And if a Lord wants his region at 100%, then it's his job to ask for help—whether he asks a courtier directly, asks a region maintenance message group, or asks the Banker (or other government member).
How is the lord in any way penalized if a courtier is pointed in his direction to help bring it up another 10%?
And what else does a banker have to do? It's the most worthless title the game has.