No tuner cares. You bring car to them and say tune it. They do. If the crap you brought in to them to get tuned is a problem, it's not their problem. They will sleep easy when you fx your boost leak and kill your engine running lean weeks after the tune. It's not their fault. They tuned the car was fine on the Dyno. Thats it.
If they do all the work they do the proper checks before tuning. I can't think of any tuner that would spend time looking over peoples work if they are just tuning the car.