Collabs - I used to be 100% opposed to collabs on posts. I didn't really think that they added anything to roleplays. They were pitched to me as a way of saving time, but it took just as long or longer to get one pieced together; if a shortcut isn't short, why bother taking it? I'm a bit more amicable towards them these days, but still feel that they aren't an end all-be all to use as a constant. They're great for pulling characters into pids and having groups of 2-3 of them have their own conversations. They're good for delivering major plot points or story arc stuff for characters. 

But generally, I feel that if you have all of the characters in a large room... might as well just do solo posts and have some freestyle interactions.