I haven’t had a delivery person knock in quite a long time. Package deliveries haven’t knocked in close to 20 years. I’ve even noticed DoorDash drivers don’t even knock anymore, they awkwardly stand in front of the porch and try texting. I now open the door as they are walking up to the porch to avoid that. I don’t know if it’s a policy or some kind of shared anxiety, but I find it really weird.