I very much don't want some corporation to be able to just take a 9 year old's drawing and slap it on their game because someone thought it wasn't artsy enough to be awarded protection.
Yours is a completely fair statement to which I have no objections.
Just because a category is fuzzy doesn't make it invalid. That's whynwe have laws to force standardized definitions of various concepts. You arguing against whatever definition I proposed would indict only that definition, and not the broader concept that there is an important line to begin with.