I love breeding and flock keeping by the seasons as well...it just seems to fit the birds, the natural food abundance and it fits me. I'm more prepared to deal with chicks in the early spring than in approaching cold weathers or during the heat of summer.
And I'm none too fond of incubators...even this more simple one I'm doing is so much more fiddly than letting the expertise of the broody do all the work and do it better than I.
I do to. More and more, I would prefer not to buck the system. I do not have to keep birds that I have to hatch in Dec. to be ready for the shows in October. My birds are showing themselves broody around the same time our Turkey and quail is. They know what time it is.