I think you may have missed the point of my question. The OP is wondering how he can maintain his productivity with a little sprog monopolizing his time/attention( he was more diplomatic than that, but that's the crux of the issue ).

I then asked why he didn't consider this possible impact on his livelihood( the productivity aspect )before deciding to have a kid.

So, to use your response as a template, I would rewrite with the following:

Let's say in 10 years he fails to get his company off the ground because 4+ hours per day that would have been previously available to him to work on his project were not, due to the presence of a child. The kid has to take out student loans, parents who have nothing to show for 10 years of stress - and if the OP had to, he could take a second job and spend what would be kid-hours with his work.