If there was no discussion as what weight to set the bow at (prior to the work), I can't blame the guy for not wanting to have to redo the work. Unless he was to be paid to do so. After doing work for someone, should you have to redo it, for free, when the customer changes their mind?
"Pro" says "no, hunt with it this way, I don't want to have to re-set everything"...
If that was the way he answered, that part was definitely handled wrong.