I can't argue with that Adam.
Maybe one can also add that if someone isn't getting great results with a springer then there may be a little voice in the back of their mind that says " This gun just doesn't feel right ". So if getting it checked out and tuned makes them accept that the rifle is now spot on, so it's up to them to put the work in, then that alone is money well spent.
I fear in a lot of cases though a lot of springer shooters still blame that tune and think that a tune from another tuner, or a different set of internals, will put things right. If tuning does all the things that you mention then it's a worthwhile effort ... but at some point the shooter has to accept that it's hard work and time that tightens those groups up.