Yeah, I'll admit they aren't perfect in that regard, but sometimes they don't need a proper epilogue.
Spirited Away, for example, ends with Chihiro breaking her parents' curse, and returning back to their car. As they drive away, the father asks her if she's ready for her life in the new city/home and she replies confidently, "Yeah, I think I can handle it."
That one line shows a complete parallel of her pessimistic and apathetic outlook towards moving to a new city in the beginning of the film. The journey into the spirit world changed her in the end. Thus, the message of the film is wrapped up and doesn't need further story.
But then there's Whisper of the Heart, which has one of the worst endings I've seen. Thankfully, their other films don't end as badly as that.