I was wondering that myself. I took it took a different LBS that lists wheel building as a speciality. They just did what I would do, put it on a truing stand, make sure it is pretty straight and "feel" or squeeze the spokes to make sure nothing really stands out (although I had already tightened the really loose spokes - without a stand). Is there something to getting a spoke tension gauge and actually checking the spokes are in a range?

I know the Easton Haven's advertise their process of making sure all the spokes are tight and even and I never had a problem with flex or staying true?

(Otherwise, the LBS did notice that both the front and the rear rim itself had slight damage (front rim slight bend so a couple of spokes on one side are really tight and Rear where a rock hit it so there is a slight ding, but not out of true). That did not recommend re-building yet. However, did not really address flex.