Judge Death wrote:
How do we know for a fact he never visited Reinette? Her letter? What does that prove? As I said upthread I can easily visualise Reinette and the 11th/12th/13th Doctor sitting down together to write it!
Do we know it for a fact? No. We only have the letter to go by.
But I think it lessens the emotional impact of the story to introduce a timey-wimey out as a way of getting around the story's ending. The point of the story was that Reinette was on the Slow Path while the Doctor wasn't. Stripping that away for the Doctor to come back for her doesn't make much sense.