These changes go to far.
I was really looking forward to coming back to BWD/BoT and finishing up hard modes after 4.2 came out and we got our raid some better gear. It's one thing to have slightly better output/health pools... but an entirely different matter when you no longer have to do the fight mechanics
But some of these changes turn the encounters into incredibly watered down versions.
Take for instance the changes to Nef
Animated Bone Warriors take 33 seconds to fall over, (down from 50.)
Blast Nova cast time increased.
Chromatic Prototype Health reduced 20%.
Electrocute damage reduced 30%.
Fewer Animated Bone warriors spawn.
Magma Stacking debuff effect reduced 75%.
Nefarian health and melee damage reduced by 20%.
Nefarian's Shadowblaze cast frequency cannot increase beyond 1 per 15 sec.
Onyxia health and melee damage reduced by 20%.
Shadowflame Barrage damage reduced 20%.
Tail Lash damage reduced 50%.
Increasing the cast time on blast nova would defiantly help those that are struggling.
Reducing the damage of Electrocute by 30% makes it hit for ~70k, mix that with Shadowflame barrage doing 20% less damage and Magma doing 75% less, and you now no longer have a risk of death in P2.
Fewer bone warriors, ~40% less time until they die and a MUCH higher cap on time between shadowflame essentially turns P3 into a tank and spank. Grab some adds. Stand still and off tank them until nef falls over.
Please please please reconsider the changes you are making. You are essentially turning fun fights into tank and spank fights with little to no regard for the mechanics. If you want to make fights easier, consider increasing the time to interrupt raid wipe abilities as well as slightly reducing health/damage (maybe 10%). But removing the mechanics goes too far and effectively neuters the fights.
I really don't want to come back to BoT/BWD and literally have all the hard modes fall over (because with these changes... they will). At least consider making these changes for normal modes only.