I know that for me when my first desire for diapers came up it was at a young age of 5 or 6, so it's safe to say that in it's first stages it was not sexual.
And just as you said it, somewhere down the line there was an appearance of a sexual aspect to it which died down about 4 years ago when I got into my 20's. Ever since then I struggled with questions like, "I don't find them appealing from sexualy driven desires, so why do i still want them?". And after moving out on my own when I was able to try out wearing 24/7 I noticed they really do have a deeper meaning to me than just occasional wearing for sexual pleasure, as it probably does for many it goes the same for me.
To some extent, with many more people than one would think, it might even dip into BIID side of things. Hell I'm even starting to accept the option that I might be falling on that part of the spectrum.
So as far as editing the classification of wishing for being diapered or diaper dependant would need a slight addition that acknowledges the bigger than described existence of a different reasoning for wearing diapers, I would agree to it