The comments on this are pretty depressing. I'm hoping they're from folks without kids. This has very little to do with efficiency and optimization.

This is probably an unpopular perspective but here goes anyways.

If you've got kids and you're trying to figure out what they'll remember and not remember in order to maximize some theoretical value -- I urge you to take a step back and look at what really matters. It's too easy to get caught up in life. Especially in the US. And even more in Silicon Valley.

You won't ever look back and wish you spent less time with your kids. Doesn't always matter if they remember it or not.