I don't recall any time they've retroactively added new rewards you had to pay for to old content. Mind elaborating?
The same case.
I've addressed that point multiple times. Instead of leveling new character from level 1 to level 80 you've leveled one character from level 1 to level 55, then another one from level 55 to level 80 which equals the same 80 levels you would have needed to gain anyway.