When did I ever say a Monk was useless? Stop putting Words in my mouth.
And have you ever been a Dungeon Master? A key point of the job it to make it challenging. Mobs get class levels, monsters get classic templates, enemies come out with battle plans.
Having a One-trick pony like a Stunning Strike Spammer is incredibly narrow minded and easy to counter/be countered.
Quick!! A class has a a unique ablity that promotes teamwork and allows them to change the flow of an encounter! Better use a blanket immunity to it so they never think that anything other than straight damage is option.
what is the point of living if you can't deadlift?
All credit to the amazing avatar goes to thoroughlyS