You'd be wasting 25 bucks and moving away from your friends for no reason. I also do my own thing in game and am not looking to be "understood" in it. I don't recommend that, stay on aether with the people you know.
Stack marker was added before SB I think, in the first quest battle with Gosetsu or something. I remember people being surprised that the ai could do that. The learning thing IDK, if so, it doesn't bode well for the future that story mode wants you to constantly dodge and deal with a pretty long multiphase fight ending in a dps check, for story mode. With the content in this patch, I'm worried they want to incrrease overall difficulty.
