I think a bigger issue is that too many writers want to rewrite the same stories over again. You can have Batman meeting Dick Grayson for the first time and not be referenced just fine... but when you have 17 different VERSIONS of Batman meeting Robin or Catwoman or Joker... then it gets REALLY complicated trying to say 'it all happened'.
My favorite bit of continuity crazyiness….. Dick Grayson was Robin before Joker appeared. Some times he was even there fighting Red Hood before he was dropped in the Goop.
That has often been retconned to NOT happen anymore... and it makes it REALLY hard to have it both ways.