> The other part is that almost no one would have the energy to spend hours instrumenting and rebuilding musl, reading the kernel mm code, and thinking hard about how they might interact.

Maybe because it isn’t needed. That’s the reason we have experts and professionals, because it’s more economical to use them than for everyone to start from scratch. It’s easier to go to a mechanic shops to fix my engine block than to try to do it myself. I’ve heard that a lot of shops charge more if you said an amateur try to fix things first.

It’s a lot of stuff, but that’s not how you experiment for an hypothesis.