You can't put Mutation breeding and Hybridizing together for a comparison of right and wrong.
You are seeing a feather structure change not a miss mash of two species in Mutation breeding.
By the way I am not a fan of Mutation breeding if it destroys our population of the normal coloured
species.
Just because the Europeans do it as the norm doesn't sit well here.Remember they have access to new
wild caught stock which helps greatly in the status of a specie WE DON'T. As the supply in Europe of wild caught species dries up
it will be interesting to see what the reaction will be then.
By the way a Canary as we know it is not a wild specie as is a Bengalese both were developed for a purpose so crossing and fiddling won't hurt,
but putting a pure specie to a Canary
Sorry but you get my no vote.