Logic Level Shifter and WS2812b LEDs

Do you need a logic level shifter with your ESP controller and WS2812b LED strips? What happens if you omit it? Get both the true specs and see a real world test with and without the shifter.
Items shown in video:
Wemos D1 Mini: amzn.to/33iHOMc
Logic Level Shifter: amzn.to/418Gq94
WS2812b LED Strips: amzn.to/3HMDaoL
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