Maybe you dont understand that dealers are independent? Toyota will not be warranting your OTT tune. Your dealer might, but if the motor blows good luck getting them to go out of pocket and you will 100% be getting a used/rebuilt one.
For the record I dont believe your motor will blow. OTT is...
I was in the same boat. I hated the first pics/video i saw. Having owned two 3rd gens and one 5th gen I can say that the 6th gen is lightyears better than the previous gens. Not even close.