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Here's my RGB (not WS2812) strip controller, for inspiration: https://gitlab.com/stavros/gamelights
> Is [Espressif] firmware fully open source and contains no backdoors?
Their SDK is Apache licensed but does include some compiled radio-frequency stuff: https://github.com/espressif/esp32-wifi-lib/tree/master/esp3...
An MCU uses less power, is faster to start from a quiescent state and typically is lower cost than hardware intended to support a full operating system.
That said, there are some who flash Pi Zeroes as "bare metal" or no operating system:
https://github.com/dwelch67/raspberrypi-zero