I partially believe they didn’t want to introduce too much beyond what Tod Howard outlined in case the next game takes place in the new ruins of California and it all gets retconned. More than likely Howard just told them Shady Springs is destroyed and the NCR collapsed so that’s all they wanted to show. New Vegas being in supposed ruin is the bigger point that opens up a lot of questions.
I partially believe they didn’t want to introduce too much beyond what Tod Howard outlined in case the next game takes place in the new ruins of California and it all gets retconned. More than likely Howard just told them Shady Springs is destroyed and the NCR collapsed so that’s all they wanted to show. New Vegas being in supposed ruin is the bigger point that opens up a lot of questions.