I've lived in this house for a lot of years and not needed a number as every other house near me does have the number clearly on their house. I'm also not sure why I should suddenly need to as Amazon Logistics (who are the only ones who have managed to mis-deliver) have proven it doesn't matter if the door number is on the house or not, they still manage to deliver to the wrong house 1/2 dozen times a year.
It's not really rocket science is it. Most streets have one side even numbered and the other side odd numbered so if they see 2, 4, 6, 10, 12 then it's pretty obvious that the unnumbered house is number 8 (not my house number btw -just an example) and the other side is 1, 3, 5, 7, 9 etc. The fact they've delivered, in this example to numbers 4 and 9 recently just proves they are either illiterate or just plain lazy, so me having the number on the house isn't going to fix that.