But that's my point. I don't think it's the same as Xbox. Someone else cannot be logged into your account on another PS4 and also log into their account on that PS4 and play a game under their profile can they? They could only play it under the home PS4 for the owner of the game. Xbox doesn't matter as long as the owner is logged in whether they are the ones playing the game or not.
I have a house full of kids and it's actually a pain to buy digitally on PS4 if it works that way since they could only play on one of the PS4's in the house.
-Listed as your primary on your PSN account.
-All users on this device can play all of your digital content on their account.
-You can play your digital content when logged in as you.
Everyone in my house plays all of my games on the upstairs PS4 #1 on their own accounts.
I play what I want on PS4 #2 in the basement which only logs in as me.