Well yeah, but once you have a good starting tune so the engine doesn't blow up or run bad, then you can take it from there and try everything out in order to learn your software. In fact, you can consider it as starting at a KNOWN POINT in your tuning and then you'll always know where you are in your own tunes. It can save you from trying something that is harmfull due to inexperience because you can reference the working tune.
It is pretty much the same as buying a PRP and xcal from a dealer, and then paying them some extra $ to do the first ballpark tune for you....Only better because I have been able to tune this platform successfully both F/I and NA; whereas with FI engines only ADC has any skills and not only are they far away, they are hit and miss sometimes too.
Not only that, I'm a lot more reachable than any other tuner because I'm a participating member of the forum, and for a while yet I'll be in the eastern USA. See, just look at all the benny's.

Of course what I get out of it is the code for myself so that later I can tune more cars.
I can guarantee that if the car is otherwise mechanically and electrically sound, and if you listen to my recommendations on system layout, that I can tune it to run well.