The "Include clip copies without effects" option in the AAF exporter is a great feature. However, many sound mixers we've sent Premiere AAFs to have complained about all the extra clips that are created with this feature.
The common wishlist item is for the "_FX" tracks that are generated by the AAF exporter to only contain the clips that have had effects applied to them, and not any of the other unaffected clips (isn't that the whole point of creating the "_No FX" tracks, to begin with? Also, does the punkrock band NoFX get any royalties every time someone uses this AAF export feature?)
This way, the AAF import is much cleaner, and the mixer doesnt have to guess which non-effected clips they have to delete from the imported _FX tracks.