A torque converter automatic transmission does not normally need a dual mass flywheel because the torque converter does the job, but a DSG is a twin shaft twin clutch preselector automatic and does need a DMF to protect the transmission from too much sudden torque transfer. The hesitation is not due to ‘turbo lag'. The software does not allow more fuel into the engine if it thinks the brakes are still on. But residual fuel in the injectors will be enough to accelerate the car a few metres into the road or the roundabout where it temporarily (and very frighteningly) suffers a hesitation of a second or so.