Yes I agree with you and that’s what I do too, but I was trying to go a little deeper … 
It’s just a natural inclination when you see something, you want to mess with it be it a slider, an operating system file or a loose wire…
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apparently art sometimes reads the colour label indications in the arp file and not in the xmp. I don’t remember this being the normal behaviour, is there any change in this respect. I had the problem with two files, the colour labels were not those indicated in digikam but in art. Once the arp file is deleted, art reads the xmp value again.
Digikam’s keywords are not in the IPTC standard, just xmp, so it makes sense that they don’t appear in art.
Yes you are right they are different…