Fallout 76 at least had a relatively small number of players per server, so you can still largely pretend you are engaged in the main plot line by yourself.

ESO has just a steady stream of other players on the same quest chain as you, with absurdly short respawn times. You stumble on to the boss fight you need halfway in progress, help bring them down, while ignoring the other players, then by the time you loot the quest item and start back out the MOB has respawned.

WoW was infamous for the competition to get your 10 bear pelts or whatever, but it didn't feel this crowded.