There'd be a pretty big difference between just unlocking the entirety of the kit for older content -with- and -without- checks and balances like an entire 'traits' system. As it stands, simply hitting the unlock button is not going to improve the experience. It will certainly make it quicker, but 'better'? Reduced item level caps would certainly help, but so would mechanics being re-worked, like what WoW did with some of their earlier dungeon content.