I'm presupposing the contact card has their job position/title, and therefore still answers the question – also presupposing the original (odd) premise of wondering who someone already saved in your phone is.
The Venn overlap between the set of "contacts in your phone" and "people with Wikipedia bios" is likely rather small. Hence why I think it's a faulty premise to complain about Siri defaulting to contact card when these two sets do intersect.
That's not the point either. The point is that if I asked you, a human, "Who is Tim Cook" and you replied "123-555-1212" or "tim@apple.com" I would be a little dumbfounded.
If I'm asking the question - maybe a friend is nearby who doesn't know them and I'm too lazy to explain - then I want to know who they are, not what their contact info is.
I could imagine some scenarios when I ask a human assistant "who is Joe Bloggs" and it would be quite reasonable for them to answer "oh you've met him, he even gave you his business card".
Sure, but only after telling you who Joe Bloggs is, because that's what you asked, you didn't ask 'Have I met Joe Bloggs?', an assistant (human or virtual) that doesn't actually help isn't going to keep their job for long.
