personal limit breaks should defo be a thing, they can even add more harsh mechanics into the game for them to be needed, like an Aoe that WILL kill you without tank lb, or a mechanic that drops everyone to 1hp and needs a heal lb, i dunno.. bad examples but it would make for better personal game play. Must admit I hate that unless your the melee dps your never using lb.

not sure putting exp potions would be a good idea tho. People may be more inclined to buy gil from gil sellers to get them from the market which isnt what we want, also it would be a rather big advantage if your an older player when an expansion hit. possible change it to an xp buff potion? think of it as storing rested bonus (untradeable of coarse)