If it conditionally showed you your lock screen depending on whether there were no notifications, the experience would be inconsistent and annoying. I think it would require a complete rethinking of how notifications are displayed to the user. I could see Apple doing this with no option to turn it off or with a binary on/off toggle, but the middle ground is just un-Appley.
I could see them putting a little red dot at the top of the screen like on Apple Watch to let you know there are notifications. Then it would at least be a consistent user experience across devices.
So you pick up your phone, it turns on to the home screen, and there’s a red dot at the top of the screen to let you know there’s a notification, so you swipe down and see the Notification Center.
Apple had (has) this feature for TouchID unlock devices... I was more than mildly frustrated that this was missing on FaceID unlock devices.
Combine the Yes option with a choice of:" only new notifications" or "no notifications". Best of both worlds.