Anime Brigade: We all have 8th grade syndrome~

[Ganyu]

By having fan service, you are already wasting precious screen time on what could've been used for character development or at least worldbuilding scenes. IMHO good writing and fan service don't go hand-in-hand. The focus shouldn't even be on the fan service. Of course, as long as fanservice is presented more of an afterthought, it's tolerable for me. I rather a five-minute cutscene than a season's dedication.