Fan service is an important ingredient for any live-action adaptation of a popular property that comes with a built-in fanbase, but a balance still needs to be struck. Lean too hard into appealing to the diehards and you run the risk of alienating casual audiences that don't have a clue what's going on or why they're supposed to care, but if you go too far in the other direction, then the more loyal enthusiasts will inevitably complain about the wholesale changes being made to the source material.