Just because the car has been machine polished, it doesnt mean its a good job of correcting ( not saying it wasnt done right ).
The amount of cars ive had to detail after they have been machine polished by a garage after having work done, or as a delivery clean is huge. when not done properly it leaves bad marring and hologram like markings all over the car often making it look worse than when it started
Im not slating the work that was done to your car as it may be perfect, just giving my tupence worth