Not true, you have the advantage of quick response through propwash when advancing the power levers and flat pitch on the prop when in idle
You are right. But if you put your props to low pitch for braking you expose a huge disk into the wind. Big exposition means big resistance. If the wind doesn't come from the direction you want, you suddenly loose directional control.
Of course you have to reduce propeller resistance and ad forward thrust, but as I said, you have to do the right thing, otherwise you loose control.
Dani