Also, there's something to be said for tradition here. Productions of Shakespeare today often use all-male casts, the decision for which may have nothing whatsoever to do with, say, a concept related to sexual politics or gender identity, but out of interest for performing the play in a manner that adheres to what, for many years, was the tradition of its performance history.
And if you don't care for that idea, let's also not forget that sexuality and gender are intrinsic components of Wilde's text -- particularly in TIoBE -- and that a director could easily construct a justification out of that.
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