Well put. In my case, because I'm the raid leader of a more casual guild where people often struggle with personal responsibility mechanics, I have to pay attention to boss abilities that normally wouldn't involve me and watch timers more closely so I can call reminders. Demo looks really cool, but I'm worried the dance of cooldowns and optimal DemEmp use will be one that requires constant attention and punishes ill timed moments of distraction.
Which is great for the people who can pull it off. I remember the days when I wasn't even a guild officer and could enjoy juggling six different debuffs at once while watching my timers like a hawk. Today, though, I need a spec that lets me get away with those distracted moments while I'm reminding people not to kill themselves. So as awesome as these videos are, I'm waiting to see how Destro shapes out once it's finally released for testing.