With the blue posts and other random things being said, how exactly screwed is your character when Legion hits? Blizzard stated they are not going to have a 100% catch up for artifact weapons, and MAYBE it would finally be caught up by the last tier of the xpac, but nothing official I have see . So, let's say you decide to play a Rogue, you level as Sub, you get thru 1st raid tier, next raid hits and suddenly sub is not only nerfed but becomes complete crap because of numbers tuning. So now, you go into next tier and are weaker in another spec that you now have to completely disavow any knowledge of having played Sub to suddenly pick up Outlaw.
Now, add in this gem, you raid 2nd tier as Outlaw, 3rd tier is released suddenly to have Assassination become the front runner. This is a spec you haven't touched at all, now just to have to grind out a whole new set of artifact power from the beginning of it. So now, because you wanted to start Sub at the beginning of the xpac, you are now working harder and grinding event more to play catch up to someone who maybe played Assass the whole time.
Is this going to be the xpac of switching mains or running multiple toons of the same class just so you have a completely viable spec at each launch? Am I reading too much into it and shouldn't worry? Does anyone have any knowledge of this being or not being an issue?