So far, so good. He’s got a better version of the same thing. But breaking out the ESP8266’s I2C pins the pins that ESPEasy uses for software-emulated I2C turns this little “switch” into ...

So you design in an external ADC chip and connect it via I2C, or you tack on a shift register and drive it with the blindingly fast I2S peripheral — something you can’t do with the ESP8266.