I'm very FP friendly, but I think that the mainstream just pays for this defect. They'll have service layers, modules, classes with some side effects sprinkled

I'm very FP friendly, but I think that the mainstream just pays for this defect. They'll have service layers, modules, classes with some side effects sprinkled here and there at every step. And if they don't get it well, they just delay a release to have time to deal with it. I'd rather have cleaner more general way to assemble code in a mathematical manner but I don't see it grow in mainstream software engineering.