Try not to include that retarded acronym in your posts.
LOL my ability to process information is just fine...I had extensive experience with feral dps both pre and post move predictor mods (starting with facemauler). The mods felt clumsy and 'wrong' for a couple weeks until you understood the way they behaved and their (evolving) limitations. FBN at this point is so good its, imo, almost foolish to argue that person would be consistently as good. Its a "learner tool" like a computer is to a typewriter. I can still type just fine with my old typewriter but I'm going to be consistently faster and more productive with a computer. Thats sort of where I feel this argument is headed.
Is it necessary? No. Is it necessary to consistently perform at the top of what we are capable of? At this point in the evolution of FBN I'd argue yes. Computers can do elementary calculations FAR faster than we can. And not only that but even if you are a wiz at situational awareness it still will allow you to process even more raid/environment/boss critical information faster than if you are having to think 12-15 seconds ahead about such matters as potentially colliding timer bars, trinket hidden cooldowns, possibilities of ooc procs, etc, etc, etc. There is always more information you can process and react to if you aren't busy thinking about something else.