I'm sure the fact that I am even asking this question will be answer enough for some - but I've been noticing on my server I see a lot of Binding Coil of Bahamut farming groups that specify that they do not want a SMN.

Can anyone shed some light on why exactly? I haven't run this myself - I've watched the videos but I have not been able to get into a PUG to go on my server and have heard I'd be wasting my time trying to use the DF...

Thanks in advance (hopefully.)