I always noticed this issue of very saturated RGB blue coming out purplish
with Argyll. This is in general, aside of metamerism problems or papers.
I tend to notice that only when focusing on a blue part, however, since
the overall photo apparence is quite perfect and consistent.
So I think that it is one of those colorimetrically correct choices but which,
to look also psychologically correct, one should employ some tricks.
Maybe commercial profilers discovered and adopted such tricks.
In my case I have to admit that a pure 100% cyan is to my eye much more
similar to RGB blue than what usually comes out from the profile, i.e a mixture
of C (which is never 100%) and some M (thus when I create some graphic in CMYK
which I intend being blue, I usually make it 100% C)
