Earlier quoted context omitted.
Perhaps set size is a contributing factor? I've bought two sets over the last few years, and both of them have had a piece missing. One was 1969 pieces (no prizes for guessing which set that is!) and the other 1222 pieces. Both occasions the pieces weren't structurally important, and were small decorative elements.
I've put together probably 50 sets over the past 5-6 years. I pretty much only buy the largest sets they make, especially Technic. I doubt I have many sets under 1500 pieces. I've yet to find a single missing piece so far. Many times we thought a piece would be missing, only to find it trying to escape somewhere. The plastic bags carry a pretty heavy static charge in dry winter conditions, and the tiny pieces love to…
But in the dark they become savage. Stand on one or even worse, kneel on one when trying to find the tv remote. I might have cried.