Will It reset all the side quests and role quests? if it does I can see why they don't reward xp again as you could just keep reloading and spamming certain side quests and role quests. or is it just selecting a specific quest line from a menu (like the unending journey menu) and running that quest and that quest alone. When you turn the quest in you are taken back to the menu.

Will it reset the environment too? Like if I redo the first quest of Shb will Lakeland still be in light? Would be off if it didn't and it reflects my main scenario progression. They're talking about light and because I've finished the game its dark out lol