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I’m disappointed that in “it takes you away” (series 9 ep. 11) everyone’s dead wives show up and yet River Song doesn’t make an appearance because that would have been so funny and also so heart wrenching.
I think would add a lot to the plot because it would make the doctor’s decision to stay in the solitract make a lot more sense and make her eventually leaving it even sadder.
Also, it would be really funny with the doctor simultaneously trying to explain to the group that River is her deceased wife from when she was a man whilst trying to explain to River that she is a woman now. It would be even better if River was like “eh, doesn’t bother me”.