Honestly, pretty much most of FCOB takes a hit if you add echo, like a huge hit.
T10 - Add phases become easier, people struggling to meet enrage should now be fine, barely any mechanics anyway.
T11 - again, easier add phases the rest of the fight is snooze anyway as long as people understand what they are doing, especially now you overgear it.
T12 - You'd push faster and get less bennus, making the fight pretty easy, as well as healers having an easier time with brands/misplaced tether dives.
T13 - Echo nerfs the fight as mechanically it's easier than T9, it just beats you down like a monster at the moment with high damage, especially if you make a mistake. Without echo everyone needs to be on the ball or it's a complete facesmasher (IMO)
I'm fine with adding echo if they really need to do anything, as people have the option to click it off, but if they start nerfing mechanics in T10-T12 AND add echo..FCOB suddenly becomes 8 man WoD, as I personally found T10-T12 easier than T6-8 pre nerf if you compare the raids when they first came out. T7 had me smashing my head against the desk for quite some time.
Fortunately I don't think they will touch T13 with anything other than echo, just like they did with T9.
