I would move either D3 or D4 and place it in the spot where D2 should be. That would allow the WiFi to work whether you're on USB, AC, or LiPo. There are some limitations here though. If a large enough power surge occurs on the WiFi chip then the PMIC might think there's a short circuit due to the large power draw and it will restart the board. The other limitation is that you can never discharge your battery below 3.6V to 3.7V. To output 3.3V from the TL1963A power regulator it requires at least 3.6V to 3.7V at the input. I think this second point is the main reason D2 was removed because setting a 3.7V minimum for your battery is very limiting. If your battery is large enough to last a while before reaching that point I would install D2 and be happy.
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