In short this retcon add something only if we want change our way to see those stories (the underlining is mine), in order to fit this vision with that retcon, because it can't change what the past writers actually wrote (like the fact Bruce was educated like a Christian), it doesn't change the fact that the contemporary writers don't care about that retcon and it can't change the fact that the entire Batman concept is about fight the Gotham's criminality, not about Bruce Wayne's ethnic identity and above all this can't change continuing to say: «He is Jewish now, you must accept that!» It can change only if the people who say: «Bruce Wayne is Jewish» were start to explain in detail what this retcon can add to the Batman's stories, not simply vaguely talking about "enhancements" or "greater context", without actually say what these enhancements and greater context should be, because the readers aren't ewes, which go everywhere the shepherd say they must go, the readers are human beings and they accept to go where the "shepherd" say they must go, only if he is able to explain why they should do that and why that is the right thing to do; independently by the fact that this identity is being W.A.S.P., Jewish or something else.
This is a menorah: