Ported tb, xp cam, 3.2 pulley on a mail order tune in his location?
If he can't scan it now, why go through the trouble of him buying a scanner just to come back and say "yeah, you need a better tune." When the solution could be to get it somewhere where he can do both at the same time? Aeroforces are great scanners, but after a tune, it's hard for some people to relay that information back to here when it's in real time.
The flip side, you don't know what exactly zzp did to that tune and it may need to be changed back to stock or lower.
I see and agree with your logic partly, but in most situations members cannot relay this kind of information very easily, that's why it's just common to say get a custom tune.