Not true. Think of it more as a rubber band between the engine and the transmission. The higher the stall the more the rubberband will stretch before the car moves. If you don't floor it there will be more slippage at the converter but no "slam" upon engagement.
One of my hot rods has a 2500 stall converter; another has a 4000 stall converter. The 4000 has noticeably more slippage on Part throttle accellerations but I would deem either of them as streetable.
Even my 5500 stall converters on my drag cars will accellerate smoothly when the throttle is used judiciously.
