I'm not massively bothered by the sexuality of the cast. As actors their job is to play a role - to be someone they are not - as long as they do a convincing job, which all of the cast do I'm happy.
I always think it's a dangerous path to start going down saying that gay roles have to be filled by gay cast members, what happens if someone starts saying that only straight people can play straight roles, we can't complain as they could rightly say that it's double standards.
As long as LGBTQ+ actors are getting roles as actors, it really shouldn't matter if the role they are playing is an LGBTQ+ role or not.
Michael Cimino has done a superb job portraying Victor, is convincing and now I couldn't think of anyone I would rather see in the role.