Benefits of co-sleeping?

I see a lot of people on here saying they co-sleep because it’s their “parenting style” or whatever, but are there actual benefits? I know keeping the baby in the same room for 6-12 months reduces the risk of SIDS, but beyond that, why are people choosing to keep babies in their room for longer than that or to have a baby in the same bed with them at all?

To be clear, I’m not criticizing. It just genuinely doesn’t make sense to me so I’m looking for insight!