I agree with everything you just said, it's just that in my (maybe twisted) mind the principle of back-pressure can be implemented in a number of ways and addin

I agree with everything you just said, it's just that in my (maybe twisted) mind the principle of back-pressure can be implemented in a number of ways and adding a blocking queue in front of a system that is falling over is just one of those ways. But yeah, I guess at some level everything is a queue (or has a queue in it) so you win.