Yep the extra flexibility is very helpful and convenient, but with years passing it becomes the norm. And kids needs increase with age, not decrease. So at some

Yep the extra flexibility is very helpful and convenient, but with years passing it becomes the norm. And kids needs increase with age, not decrease. So at some point you may realize that there's no more flexibility, you have been stretched to the limit or even further and everything is suffering - you, your work and your family. That's why I think it's dangerous - instead of having a clean cut between work and family we take it just a little bit further every time , all seems fine and productivity is unaffected, and so on until something snaps. So I'd rather say don't make such arrangements the norm because there's no easy way back to full work/family separation