Yes, you have to service it, no matter what movement your rep
came with. You can of course risk it and have the movement eventually die.
But the weakest part off the rep is not the movement but the threads in screw down crowns. They will die before your movement and in most cases are not replaceable. So your rep will be only good to sell off for parts.
That said, you can make rep choices based on that.
Any crappy Asian 2824 that comes in reps can be replaced with a brand new Seagull 2824.
And serviced will last you a life time.