I've often thought about this, because I write quite a bit from assimilated knowledge and I know people are often thinking that if there's no specific reference to research the author must have "just pulled the material out of the clear blue sky". If the material came from a single thing, like x number of personal experiences, adding that into the Hub body would be easy. If it came from, say, research done in a previous job that was related to the subject - same thing. If it comes from, say, a few decades of living as an adult, maybe doing research for other writing in the past, maybe x number of personal experiences, maybe extensive personal reading on subjects not related to one's job (or previous jobs), things one has learned from "going through things second hand" with, say, close relatives/friends; individual courses taken, etc. etc., adding all that kind of mix of stuff will turn into a Hub about the author, himself. And, it's not easy to get it all into a nutshell.
So, i think having an "about section" is a good idea (at least for some people and some Hubs), but I don't think it needs to be either a short version of the profile or a copy of the profile. I think where it could be a good thing might be when the Hub isn't, say, a Hub about beading and written about someone who has that hobby; or a Hub about plumbing and written by a plumber. OR, when it's a Hub written from research, with the writer being "only" the writer - not being the one with the information to offer himself and from his own experience/assimilated knowledge.
I think what could be useful would be more an "about me as it applies to this particular piece of writing". I don't know about anyone else, but I have only a few subjects/categories that I wrote about and that come from "living" rather than research, but I write often in those categories. I've recently been considering about doing five or six pre-written "about type of things" and adding the appropriate ones to Hubs that could use it.
It isn't even just whether people question where the info/insight comes from. I've had people "commend" a Hub and say "good research"; and I'm thinking, "Hey* That's not research! That's three or four decades of blood, sweat and tears!! I don't need/want credit or "a medal". I do want people to know, though, that it comes from more than just looking up a few things online, or even adding corroborating URLS I didn't use in order to "look more professional".