Descriptions saved to both descript.ion and file's Comment?

So it is expect for Opus to write the description to the EXIF data as well as the "descript.ion" file?

If that's the case, why is it one or the other when it comes to "descript.ion" file vs NTFS Comment, but not for "descript.ion" file vs EXIF data?

What is the purpose of the "descript.ion" file if we are duplicating the information into the image's metadata? When writing to "descript.ion" files, I think it would be preferable that the image/file is not modified.