How i see this vote...
1) "Easier class/spec mechanics - Harder raid mechanics"
Voted by people who like more PVP like style where you have to learn/react more often and get new "emotions" as often as you can.
IMHO may stress to much players that don't like learning process.
2) "No change - happy with status quo"
Voted by people that like how it's now. (My vote)
3)Harder class/spec mechanics - Easier raid mechanics
Voted by people with specialist mind, they like to learn long at start but then use those knoledge again and again and again.
IMHO will become boredom for those who get exited by learning process itself. Because different bosses will still look pretty similar.
Now about DBM and other things. IMHO dev don't balance anything around them, yeah they take their existance in account but all encounters are doable without them...
About DBM even if you "ban" it you can't "ban" https://media.istockphoto.com/photos...re-id159756787 and all hardcore people will use some kind of "NoteBook" that give information what is comming next and when. Blizzard could easily make (non-rythm style) encounter that can't be DBMed like with heavy random timers and ect. they even tried it some times (and this become hardest for players, because people with bad reaction time and not very good inner time feeling have problems with such design). About devs developing around DBM just imagine (example Dev thoughts: now we have to add some work for healers... So they will be healing raid damage, it will come from fire spits from boss, at 3 random targets by 60% of their max HP, every 30 sec... WAIT THEY HAVE DBM WEAKAURA and ect... So it will be 5 targets 80% HP and every 20 sec.) For me this sounds bullsh***t. I'm sure they develop around players they aim those encounters for... When they created those overtuned KJ and Avatar they made this because they wanted to make really "On the Edge bosses"... But misscalculated that "Edge" to high... If there won't be TF or DMB that "Edge" would have been at same overhigh level (for example demanding to farm previous Mythic bosses for Mythic quality gear for 2-3 months) because they wanted it to be really "on the edge".