From what I've read it seems it has some programmable hard/soft-IO bitbanging subsystem, I speculate it can do bitbanging of various protocols efficiently. I greatly appreciate this attitude. It makes any protocol "driver" repairable. Including I2C.Is the Raspberry Pico still affected by the I2C-BUS issues of the other raspberry models?
It's not clear if they measured total power demand or if they separated out MCU power demand from that required by 12 NeoPixels. Further, "full brightness" for a single NeoPixel means around 60 mA or 300 mW at 5V, so there's no way that their numbers are valid if they include the NeoPixels in the total.0.4 watts is not low power.
I’ve worked with lots of Microcontrollers that run on less than 0.001 watts. Some as low as 0.00009 watts.