I've been hesitant about these kind of sleep gowns or sleep sacks (see picture). I keep reading that they are easy and helpful for night-time diaper changes. But confused on the logistics if you swaddle or put baby in a sleep sack too? Do you swaddle them in this kind of gown? Still put them in a sleep sack? Isn't there a ton of bunched up fabric then?
Maybe these are for when baby is older and not being swaddled anymore?

Sorry if these are such "newbie" questions. Can someone explain how you make it all work together for this FTM? And did you really like these kinds of gowns for your baby?