[blenderob]

> is being able to run busybox part of that specification?

It's the other way round. This is like asking if running RHEL is part of the specification? Obviously not. But RHEL provides an environment that is quite close to the specification.

So is running a busybox part of the specification? Obviously not. But Busybox provides an environment that is close to the speficiation.

[immibis]

Then it would be busybox's responsibility to make busybox work.