I've spent a fair amount of time in core.async, and I feel like I'm on the edge of enlightenment here, but I don't quite understand how CSP helps with this example. Is the point that you can take multiple puts off the channel in one go? That's the only thing I can think of.

Maybe you could present the CSP alternative, and a basic example use case?

* edit: I guess a basic example is a sliding-buffer that only keeps, and thus only reacts to, the last mouse event. Is this on the right track?