[cmacleod4]

That sounds very familiar to me. I'm now retired but in my last job I put together a simple C++ framework to do something similar. I used this in a small part of a financial trading application. Like you, I was convinced it would pay off to apply much more widely, but I found it difficult to "sell" the idea. As you say, the real payoff comes in complex situations, which simple examples don't really convey. However lots of people seem to be playing around with reactive programming now, so perhaps it's an idea whose time is coming.