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This past week I've been on a mission to find the cheapest microcontroller that I can reasonably learn to program. I've gone down the STM8S 001 rabbit hole and found this https://github.com/TG9541/stm8ef/wiki/STM8-eForth-Example-Code
I haven't had to go to that level with the ESP32, but ESP-IDF is open source, and I'm not sure what else you would need if soc/spi_reg.h doesn't have enough info to let you write your own SPI driver.
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Hence, a higher number means a more popular project.