I've made my views clear in previous threads but I'll say them again I guess.

The complaint of cliques on discord could have been applied to the guild long before discord was popularized/existed. It just was behind "closed doors." cliques gravitate towards each others rps and its not necessarily a completely bad thing (it is better to rp with people you know you'll mesh well with) But of course there is always the issue of inclusion/exclusion. I don't think it was any harder to "talk shit" about other users/threads with the PM system or on skype or texts or whatever. "talking shit" is going to happen organically whether discord is there or not, imo there are other venues one could reasonably do the same.

I feel discord simply made it more OPEN and obvious. 

As for the activity thing, I think it might be correlated but it doesn't prove causation. Yes, obviously spending time on discord is time you didn't spend writing an IC post, but theres a dozen more things imo that distract from posting on IC, and I'd find it difficult to point blame solely on discord. As Saint Maxx pointed out, if someone wants to post they will- If someone is flakey they will find other things to do other than post.