Board Thread:General Discussion/@comment-25814498-20170501170235/@comment-25814498-20170914001103

There is no evidence whatsoever in the manga or anime which suggests that changing one's proficiency in any category is anything other than a specialisation technique. If an enhancer were able to decrease all other categories to 0% there would be no reason why Kurapika would only be able to do so when he becomes a specialist during Emporer Time. Moreover, most enhancers don't use any techniques other than their natural category to begin with, so with this hatsu in particular, unless the user has other hatsu's which incorporate other categories(which would in themselves be inefficient due to the how low their affinities would be in said categories), they would be gaining an enormous amount of power with little to no repercussions, assuming it is even possible in the first place.

As such, I would neither call it plausible or nice, in that respect.