Something like this will come down to the quality and capability of each individual shop. The employees in each store play a huge role in how good a shop is. The answer you were given is very strange, and I would never give them a second thought. But you could go to a Bob Jane two suburbs over that could be brilliant. If you want a suspension tuned, you're probably going to be best off going to a suspension specialist, as what they will deal in 90% of the time, rather than being a tyre and wheel specialist that does suspension maybe 10% of the time.