Actually your proposed changes would help me greatly. I personally have significant trouble keeping up with more hectic battles since I can't concentrate, regardless of my lack of latency. If I could "90% percent of the battle is prep" as I understand your argument to be, it would play much more significantly to my personal abilities, being much better at golf and curling than I am football or baseball (your proposal not being dissimilar to golf. You need to read the feild and the atmosphere and see which tool is right for the job.) And I'll give you the benefit of the dlubt that you only mean aoe mechanics can be ignored not mechanics in general. If you fail to destroy the nails, you still die to Ifrit.

However, I don't see your plan being actionable. The enemies would need to give the jobs plenty of things to dodge and the classes their own things to do so the fight isn't a forgone conclusion once they allocate the stats.