I’m pretty sure the muscles are controlled by the same nerves/neural pathways. A lot of people can’t shit without pissing also but once you have shat you don’t need to hold those muscles so you can let loose. It’s a bit like trying to wiggle your ring finger without moving your pinky or middle. Except with your dick.
Has it ever been done right though? A capitalist entity’s mandate is to grow itself and extract maximum profit. It is obliged to become as unfettered as possible to achieve that. This is inheritly unsustainable and in conflict with the interests of society and the environment at large.