Just had this happen to me again and it's been an increasing phenomenon over the last few years.
Someone came round to pick up something I had listed on olio - sent me a message saying they were outside, I was busy with the kids so wasn't paying attention to my phone and they then messaged to say they would go home as I wasn't answering the door, but they never actually rang the doorbell?!
Tradesmen, people collecting stuff I have listed on Olio/Freecycle, even the kids' friends parents when dropping off for a playdate all seem to do it now. How is this sensible Vs just ringing our perfectly functioning and visible doorbell?!
Is this just me?