I think this common truism is less true that it sounds at first blush. Sure, nobody wishes they spent more time "grinding away" at work. But I think lots of people find a calling in their work, and do indeed wish they had been able to spend more time in its pursuit, while also wishing they had spent more time with their family.

Just to take the most extreme kind of example, I think scientists who have really hit on breakthroughs in their field feel more strongly that they wish they could have kept that up, done more of that, for longer.

But I don't think that pattern is unusual at all. Lots of people find work that they believe they believe is valuable and that they are effective at, and only regret that there are not enough hours in the day to do all the things they value and find joy in, including their work.