Right now, in the Dominion, you can go killed the Shade of Naemon, then head back to Grahtwood and watch him die, and then finally take a trip over to Auridon and kill his wife and meet him for the first time.
This is kind of ridiculous, and something that seems almost exclusive to the Dominion. I'm not saying Zenimax needs to lock people out of zones again, they shouldn't, but they should at least make it so you can't pull all these time travel dragon breaky shenanigans if they don't want the base game to suffer from the fact everything is less linear now.
Or at least add some lore saying that Mannimarco's ritual with Chim-El-Adabal *** up time on the mainland or something.