Because this board isn’t ‘compile and flash’ like an Arduino, ... It’s a shame the module doesn’t have more of the GPIO ... (BV502) connected to the ESP8266 not only gives you 20+ GPIO ...

ESP8266 is a great module. I suggest you this also great application: Fishino. Fishino is an Arduino compatible platform with WiFi, RTC and SD card, ALL in ONE.

This board is a complete Internet radio based on ESP8266 Module and the Arduino. The board has a stereo earphone jack plus two speaker connectors and a on-board 2.5w HiFi amplifier.