sure, but that's all details, and there are other cooperative scheduling models which aren't excessively eager. this isn't to be a downer on this implementation

sure, but that's all details, and there are other cooperative scheduling models which aren't excessively eager. this isn't to be a downer on this implementation, or other implementations, but just generally pointing at cooperative advantages, of which there are many, with one particular implicit and major downside, which is starvation when the cooperation contract is not adhered to.