I think that's confusing liability with speed. Running interrupt-free code on an ARM or AVR is incredibly reliable. I would argue much more reliable than going

I think that's confusing liability with speed. Running interrupt-free code on an ARM or AVR is incredibly reliable. I would argue much more reliable than going to the length of patching the kernel. Just because it's slow doesn't mean you can't predict what's going to happen, they're two separate issues.