I'm not sure that term is quite so appropriate. So, "OC"/"original character" comes from the community of people who create fan works for various media. In that context, they're essentially fan inserts, and while there can certainly be overlap in that regard as far as RPGs go - particularly with games set in a preestablished IP, like Middle-earth or Star Wars- there's a common trend in that community that isn't so common in the RPG crowd. Admittedly, this is anecdotal from my experience interacting with a few people from that scene in my younger years, as well as a younger cousin who currently engages in it, but there is a certain protectiveness and specific view that the creator tends to have for the character that is generally at odds with the randomisation aspect of RPGs - it is akin to those GMs who people often feel would be better served writing a novel.
At a convention game a few years ago, I experienced a player with this mentality at the table, and I have seen (as an outside observer) this occur a few times online. It seems to be a burgeoning trend that I personally think it warrants being considered it's own playstyle (even distinct from neo-trad, if going by the Cultures of Play article).
While I certainly think it's commendable for a person to change their opinions with new information, the post
@AbdulAlhazred linked earlier (I forgot to post my thoughts on it, sorry) was simultaneously frustrating and vindicating in that Baker seemed to finally recognise what some people were saying at the time and in the intervening years since.