1. That I did not work 78 extra weekends 2. Did not squeeze an extra 3 hours into each of my 8 hour workdays 3. Had more days where I had a vacant look in my eyes, while interacting with people I love, cause a work problem was bothering me.
There is a product to ship, damn it, and Family should never be a priority.
The idea is that as parents, we send subtle signals to our young children about how adult life should be. A father spending 6h a day at work and the rest with their child is preparing a personality potentially lacking a builtin discipline derived subconsciously from observing the parental example.
This has nothing to do with your worries about your death bed regrets. They're valid too, but besides the point the PP was making.
And some parents just don't like their kids and use "sacrifice" as an excuse to have fun at the office.