You speak of such truths :D. It's a seriously under-documented knowledge gap on the Internet. There are an infinite number of Cortex-M4 MCU's but only a few I w

You speak of such truths :D. It's a seriously under-documented knowledge gap on the Internet. There are an infinite number of Cortex-M4 MCU's but only a few I would recommend hardware companies actually use, primarily due to power consumption of production work-loads (sleeping and deep sleep) and the software packages that are bundled, both of which are generally not assessed before choosing hardware.