It’s a nice luxury to have, although obviously it isn’t everyone’s cup of tea. If it’s only borderline financially viable then there will be a lot of pressure. You both have to be 100% on board and have the same attitude to saving/spending.
It’s worked for us largely because there is enough money for us not to have to make any sacrifices. We’re far from superyachts-and-private-jets levels of rich, but we’re well off enough to privately educate the dc, have a lovely standard of living and not to be affected by COL.
Me taking on all the mental load of the child rearing, being able to go to all the school things, pick up sick children within ten minutes, manage tradespeople and house maintenance etc has freed Dh to focus his mental energy on his company, work crazy hours and to travel as necessary, which he fully and vocally appreciates.
That’s not to say he never sees us or doesn’t participate - he’s actually very hands on. When the dc were little and then at primary school, he stopped work at teatime to cook for us all, spent the evening with us, bath time/bedtime etc and then the laptop would come out again and he’d work till midnight.
We have always been completely supportive of each other’s roles, which is key, but the bottom line is that there is more than enough money to oil the wheels.