I do agree about the hormones part, but also, for arguments sake, if you put say a baby Aro in a 10G grow out and keep religious water changes and feeding it may not get stunted, but will get deformed...
Also, i think when breeders do it you know they keep up with water changes etc coz thats their lively hood, their "money"... Where as with regular keepers, we have work, life and everything else to deal with and can at times easily neglect water changes with busy schedules...
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Well of course the arowana would get deformed, he'd be bigger than the tank...