Playcount is a very important number. It should be saved in the music file, the tag.
But it's only saved in the database.
I think your case would have more value if it was explaining why playcount is such an important number, that is what are the use cases for it.
My general request: All informations should be stored in file tags. Why are some informations in the tags and others in the NI database?
I can understand why it should not be in the file.
When you share file with somebody, it falsely show in their collection as having been played 20 times.