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I think this is a mistake and his comparisons don't work as when it comes to straight roles casting is effectively sexuality blind. If it is then just about authenticity rather than opportunity, then he would have to argue that straight roles are only played by straighy people. https://www.mirror.co.uk/3am/celebrity-news/russell-davies-explains-straight-actors-23305580
It seemed on odd thing for him to say, given that arguably his best series Queer as folk had the three main gay characters played by straight actors. Very convincingly I might add. I think James Dreyfuss' comments on this are very pertinent.
Leading on from this should gay characters only be created by gay authors? Are Ian McKellen & Derek Jacobi forever doomed to reprise their characters in "Vicious"?