I been using esp8266 but have been looking to learn more about STM32 and RIsc-v since its closer to the hardware. On a commercial standpoint, wroom-02 is fcc p

I been using esp8266 but have been looking to learn more about STM32 and RIsc-v since its closer to the hardware. On a commercial standpoint, wroom-02 is fcc pre certified. An example of the sipeed nano dev board with WiFi on board is this, which uses esp8265 https://www.seeedstudio.com/Sipeed-MAIX-I-module-WiFi-version-1st-RISC-V-64-AI-Module-K210-inside-p-3206.html https://www.seeedstudio.com/Sipeed-MAIX-I-module-WiFi-versio... If someone were to use STM32 for business logic, why wouldnt they just use an esp8266 since its a microcontroller, wifi, and the wroom-02 is pre certified? Also, for clarification. The STM32 is based off of ARM Architechture. Whereas the Sipeed Longan Nano competes against the STM32 but is RISC-V based?