Flaws make a fictional character engaging, but the flaws on a representational character can be easily perceived as a comment on the the whole group. If Wyll had a more complex personality, people like the OP would point out the supposed racism behind the darker parts. For reasons of safety (white) writers will create dull goody personalities for PoC characters.
Lots of good points, but I think this part becomes more difficult to avoid when the game only has one black origin character/companion. Regardless of the devs' intentions, he kind of becomes the representative for how they choose to portray black main characters. If the game had six black characters with backgrounds and story lines then I don't think anyone would think it was racist if each of them had different negative traits and complex personalities. On the other hand, making the one white guy a paragon of virtue in such a scenario might be interpreted differently
