For me, as with most of King's Batman stories, is the implementation. I mean, Snyder did almost exactly the same storyline with Superheavy and Bruce/Madison, but there there was a huge build-up for that moment and the realization that Batman cannot be happy while highlighting the tragedy of it.

Here it seems to be someone else making that decision for Batman because... I don't actually even know why as the story hasn't done anything to imply that being with Selina has harmfully impacted Bruce being Batman has it?