Mellotronists

Please excuse the question but I would like some logical explanation 
as to why people like to MIDI analog boards.  My Prophet 5 has midi 
in/out, no thru and truthfully only used it once to make a recording 
with other instruments. It seemed to be more of a pain in the ass then 
it was worth.  Frankly it seems easier to me to just have them routed 
thru a mixer and at the ready.  Those global changes can be a disaster 
if you forget what is where.  Again I really don't have a good working 
experience with Midi so be kind!  Doug