It's actually very ideal. The support system is far superior to what you'll find at a day care or elderly care facility.
There can be big benefits to being near your family, including health and mental health benefits, besides the economic benefits. Recent parents being able to lean on the grandparents, rather than sending kids to expensive daycares that frankly don't really care about the child as much as a grandparent will, for example.
I would tend to disagree with this. Grandparent may value your child more than worker in daycare, but socialization of your child will suffer a lot, so will its development, child need to be with peers and not home with 2 old people. Same goes for playing and learning, there justisn't enough stimulation at home compared to daycare.
Who says children need constant stimulation? They've historically had no trouble filling the gaps with their imagination. If anything, I think that attention span has suffered greatly because children are never allowed to be bored anymore.