100% this. Many babies sleep so much more restfully on their stomach. "Back is best" is absolutely great advice if you need to distill it to 3 words, but it's oversimplified.

The complex version is:

• Newborns should only be placed to sleep on their back. Swaddle them tightly so they can't move. No, tighter than that! It seems way too tight, but they LOVE that and it will keep them safe.
• Nothing in the crib. No blankets, no pillows, nothing that could suffocate them. They don't need anything as a newborn, just one swaddling blanket.
• SIDS is highest during months 2 and 3. The risk goes down over time.
• Once the baby can roll over both ways, it's not realistic to force them to sleep on their back. Let them sleep where they'd like. However, then it becomes EXTRA important to make sure there aren't suffocation hazards in the crib.
• If you're worried about SIDS because your baby is sleeping on their stomach - or even if you're just worried in general - you can buy a movement monitor that alerts you if your baby stops breathing. There are many such devices.