aren't bike shops great?
I get some of that kind of conflicts of opinion in the same shop sometimes (where i am having my bike made actually) they drive me crazy.
I have had the same thing said to me "smoke and mirrors" Bill Freeman at Elliott said pretty much the same thing (we don't use a Serotta machine because what's important is how you feel)
sorry. I think that the guy at your first shop DID help you. that you don't NEED a Serotta machine, but the Serotta machine also has merit.
and also the old guys (like Bill) who can eyeball you and help you are also
doing a good job.
it's not black and white