I am not a fan of this method, although it does have the advantage of eliminating one thing from the equation, but at a price.
It reminds me of the old Ford "replace with known good part" method that used to bug the shit outta me when I worked on cars for a living. To me it basically equates to guessing, which I have done much of (and been right and wrong), but to hear it coming from the mfr always bugged me, like they didn't know either.
I just picked up a bike for my kid and the prior owner said it needed 'major carburetor work'.
No, it didn't, it just needed to be cleaned, a new idle jet and gaskets/rubber parts, and assembled correctly, which btw I effed up the first time.
I am a big fan of trial and error and live and learn I guess.
But if you got the $$$ it makes it easier.