Personally I didn’t love the engine for fallout 4 when it came out, let alone in the train wreck that was fallout 76. IIRC most of the people I saw complaining about the reuse of assets were specifically calling out that Fallout 4’s engine felt a little old when it came out in 2015 and that reusing it was pushing the age limit for a AAA game engine in 2018— especially when you consider that it was from a studio as lauded as Bethesda.
Fallout 3 didn’t have a great engine, but people liked it, and people didn’t mind Fallout New Vegas reusing that. Fallout 4’s engine was/is hot garbage, and Fallout 76 was just squeezing whatever cash they could out of that garbage fire.
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