Yes Pat, I agree. But the converse isn't true... a bow isn't perfectly tillered if it's terribly unbalanced/untimed.
I'll pass on the Gizmo for character bows, thanks.
If one learns to properly tiller(including dynamic balance) good character bows early on, not the doggy, fragile, novelty ones, it can help him learn to make all of his bows better. Making selfbows with only the straightest staves limits choices, experience, knowledge, and skills... and it gets kind of boring. Better bowyers do both well.