The fumbled big time with support for mods. You’d have a hard time making enough content for just the main game, no way you’d have the resources for more content in the multiple universes.

There should have been a mod framework from the beginning, and a developer tutorial for how to add mods into the multiple universes and Bethesda guidelines on how to make your mod match the Unity system. So characters and faces can change every Unity at a minimum.

And settler system was also a failure. Can’t have a living outpost if people can’t just show up Fallout 4 style.