considering most animes are adaptions of manga, it’s technically not an “original performance”. the original performance is the source material itself. english dub is every bit of an adaption as japanese dub. the argument for subs would be that japanese performers are more likely to perform to the nuance of the material, and set the tone for being the first adapters. it’s not because it’s the original performance though.

edit: why the downvotes? i’m right.