Digital BW, The Print

I need a reminder on this as to why we do the way we do.
Admittedly I get confused about all the selection points available, 
so I simply try to make them all the same at each step.  I don't know 
which point in the process makes the final decision (?)

As usual, I'm going to ask the question and then go about doing 
additional research.  Forming the question always seems to help 
direction me ;-)

If I had all my druthers - I would...

1. use Adobe RGB 1998 as a space setting all the time, for 
consistency to act as a constant to deviate from.  I'm not attached 
to that particular space, but it seems widely accepted.  Colormatch 
would be my second.  sRGB always seems to drop magenta from the 
equation and therefore I like it least.

2. Print from CMYK and let the whoever interpret from there.  Reason 
being is I can think better in the separation using CMYK.  I know 
with the MIS VM inks what tone each carries, and if I wanted more of 
that tone...I would adjust the curve for that channel.  So the 
thinking goes.

Faults in the logic?

TIA,
Cleavis