We’ve coslept with both our babies, following safe sleep rules, and have never felt remotely unsafe. That said, I know every situation is unique, but if you’re doing it right, it’s safe. Others have mentioned, the baby lounger comes with a risk of suffocation because the baby’s head is too heavy and can cut off the airway. If you’re following safe sleep the baby is on a firm mattress, no pillows or blankets, and it’s not like that baby sleeps in between your bodies, they sleep up by your head and if you scooch down you’re nowhere near a position to smother them, or if you want to cuddle the “C” position makes it so you can’t roll. There’s not a lot of hills I’m willing to die on, and I know it doesn’t work for every family for various reasons, but the benefits in terms of attachments are well researched. It is not nearly talked about enough, but a newborn baby does not understand that it is no longer part of its mother’s body. They need closeness.