My point about running on microcontrollers is that the Linux kernel (and oom-killer in particular) has been tested on more use cases than most developers usuall

My point about running on microcontrollers is that the Linux kernel (and oom-killer in particular) has been tested on more use cases than most developers usually consider. This testing/usage has revealed mistaken design decisions and bugs. Very few process managers created from scratch will have been tested on nearly as many use cases and will naturally not be as robust. I do agree with you about the hybrid solution, with a twist: since the oom-killer has been so widely tested, I would think that if someone needed different performance parameters, it might behoove them to start with the oom-killer and tune it, modifying the source if necessary, instead of re-inventing the wheel from scratch.