alt Hacker NewsI actually disagree.
We have lower power bare metal systems, think AVR/STM stuff (in the 1Mhz to 50Mhz range with 128K or less of RAM) here FreeRTOS, no freeRTOS, custom driver code and some basic application code makes sense. For simple to very complex systems.
Then there's 1Ghz+ stuff with an MMU and 2GB+ RAM. Linux makes sense here.
Companies are now making chips 200Mhz+, 4MB RAM, with no MMU. This is precisely where Zephyr excels, you want a full networking stack? Switch that on. A file system, easy. Driver for some more complex thing? Maybe an SDIO radio? boomboom
nRF52820 is 256 KB Flash and 32 KB RAM chip. Actually it's around 150 KB flash, because you need space for 120KB softdevice blob (and some RAM too). And it's perfectly enough for many devices. They want developers to use Zephyr for this chip.