I once wrote an article defaming electronic EQ for studios and got a
nasty
email from a gent who made his living selling gear. I think his
background was live sound. It made sense that he would think that way.
Live sound is an entirely different beast. You have no control over the
environment and it can change even in the same venue.

Live sound is definitely a different beast. First & foremost is the
fact that the mix does not leave the venue & need to translate well to
other systems. Additionally, as Ty points out, there is generally
nothing the live engineer can do to alter the room's acoustic behaviour
anyway, so a bandaid is better than no bandaid. In the few concert
halls which provide variable decay times with arrayable curtains or
banners, I deploy these as determined by the program material; strings
only calls for longer RTs. If we have a guest vocalist, pianist,
percussionist or prerecorded text parts, I'll bring in more of the
curtains to damp the RT somewhat. Then there is the fact that the room
acts differently during sound check than it does with the audinece in.
So, yes, we use system EQ for live sound, understanding it to be a
necessary bandaid which addresses a completely different set of
circumstances than exist in a recording studio control room.

Scott Fraser