Are you even trying to apply that pvp gear is harder to get? No matter how bad you are, you will still end up with the best pvp gear, but you defently wont end up with the best pve gear.
You do. Thougth you can due hm maelstrom without some serious gear(me and my frind manage it(we have never done a hardmode before we did it(sent and sage).
From my point of view HK-51 was to easy to get.
Only new gear optained while ftp you wont beable to equip(though I belive only the gear you have equiped before you went ftp while be equipable if you un-equip it).
Dual spec? Frankly you can remove it from list since its already in-game(sub dont pay to respec and with legency perk you can do it anywhere/anytime). Of course there could be some improvments(like actually have 2 specs with own quick bars - re-arrange skills everytime you respec is timeconsuming!).
Sitting in chairs is proberly a huge update for BW(I'm pretty sure they have taken some serious short-cuts since its not already ingame).