the problem is: the very most of the playerbase are simply bad and has no idea how their choosed class works. plus they don't want to work even a little bit to clear the content. but somehow they want to clear coil. look how many people stuck at t9. we built a new group with only 2 people who had a t9 kill. the other 6 were new. and we cleared it within 4 days (we were raiding 3 hours one day, so 12 hours in total). and we didn't used voice chat... 3 days for t10, 2 days for t11... now we start with t12^^

we are just normal players, a few evenings of 3 hours can everyone spend to clear the content... sadly most people are simply too bad and that has nothing to do with hardcore or casual and how much time you have for playing.