The parenting is what I was thinking. While you were working and parenting lots of people were just doing one or the other.

You can hang out with all the SAHP now!
When my wife stayed at home or worked part time, she volunteered or went to some meeting at the school almost everyday . That’s more common with little kids though. I think she misses that more with here full time work than anything. My first year of full SAHD I volunteered more than ever but not as much as she did.

Health is a lot easier to take care of not working( unless not working causes depression). More time to do healthy meals and snack management and play/exercise and get family members involved in stuff. More time to support family in general.

And still have time for hobbies.
Did I mention hobbies? OMG hobbies are so awesome!