Show me how time slicing or deadline scheduling would work with multiple priorities (InterruptExecutor's) involved. Show me how a task in an InterruptExecutor would priority boost a task of a lower priority, switch to it, then switch back to free up a locked resource. I don't see how these things are feasible in Embassy.
There's a large number of things that the cooperative scheduler can't do. Maybe you don't need those things, that's fine! Embassy really is quite nice for cooperative task scheduling. But to benchmark a context swapping RTOS which can and pays the cost for doing so, against a cooperative task queue scheduler... these are not at all the same things, and won't have the same performance characteristics in simple scenarios like the one in the blog post.