Fixing old world machines to have an impact on the world. Yeah, they need to be re-repaired occasionally because they are a multiplayer game but no other game did this. Even New Vegas, fixing Helios One just gave you some reputation, sending the power to Freeside didn't light up the streets more or Quarry junction lead to workers fixing machines or Boulder City (where the concrete was sent) fixed up. Even Fallout 2 with Gecko didn't have anything that lead to things not working until you optimised the plant (which looking back would have been sick)
Meanwhile in FO76 fixing a power plant not only provides power to that workshop, but also a whole bunch of others based on power grids. You can repair an ammo factory to make ammo, repair an auto miner to dig up materials.
I hope such massive impacts make it to the next single player fallout, maybe without regular workshops as they would be OP for a single player game. But doing a quest to fix a Power Plant, mine, water treatment or factory (maybe needing to buy/find/make/steal specialised parts) with occasional radiant quests to do patch jobs or the ability to send settlers there to keep it maintained is something I always wanted to do.
Don't get me wrong, some steps I hope are just for the spinoff. But rebuilding these facilities and having a tangible impact was always something I wanted to do.
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