While i pretty much agree with you, especially at this point and time in the lifespan of the 7.3 and the amount of tunes that experienced tuner have written. They can take one of their tunes, do some custom tweaks to it and email it to you. At that point it is a custom, not a canned tune, you are the only one with that particular tune. However, when the tuner clicks on file and save as, it now becomes a canned tune the next time a customer is having the same issue.
Probably, when you call said tuner and complain about your issues with your tune, he will look at his file and see Tune XXX with softer shifting, hmm, exactly what my customer needs. Then you are getting a canned tune.
Even live tuning starts out with a canned tune, and then custom tweaks are added to make it perfect for your particular truck and driving habits and needs.