I'd like ZOS to consider adding options for under 50 and over 50 for zone stories at least. No change to the quest or loot, but I think it would be nice for lower levels to be able to do the quests while not being overrun by a pack of 2000+ CP players annihilating everything in sight.
I just finished the Golld Road quests and felt bad for the level 10s who were working on the early fights while tons of high CP players just kept pouring into the quest location. Automatic sharding probably wouldn't work because some new players probably appreciate the help.