This argument works against any thing you could do besides AI work and thus has to be considered in that wider frame. Going to the gym does mean less time for AI go well. Building a house. Watching Netflix. Some of these are longer time investments and some shorter, but the question still remains. Answer the question first how much effort you want to invest into AI go well vs. all other things you can do and then consider the fraction for children.
This argument works against any thing you could do besides AI work and thus has to be considered in that wider frame. Going to the gym does mean less time for AI go well. Building a house. Watching Netflix. Some of these are longer time investments and some shorter, but the question still remains. Answer the question first how much effort you want to invest into AI go well vs. all other things you can do and then consider the fraction for children.