The rules is suppose to work like this: If your floor 1,2,3,4 has 5 packages or less then it goes to the shelf; 6 packages or more are suppose to stay on the floor.
I'm not incredibly up-to-speed on how the dispatch plans work, but it does occur to me that on any given day, a business may order more than 5 or less than 5 packages; point being, unless the dispatch program has an if->then->else functionality built into it, the PDS has to dig through all floor stops and move them around the trucks appropriately. Additionally, drivers who have specific stops in specific spots are no longer afforded that luxury, and must dig around to some extent.
From a loaders perspective, too, maybe there are only 4 packages for Bubba's Gumball Emporium, but they are massive (either dimensionally or weight); clearly, they are not going on the shelf. Admittedly, I don't think that is a problem, as large boxes should not be on the shelf; regardless, this strikes me as more a "rule of dispatch" than a "rule of loading".
Thinking further, it also occurs to me that using the DataTool available from SharePoint, there is a button in the far right column (Production tools? or something to that effect) that will report on any floor stops that have 5 packages or less, alleviating the need for the PDS to manually hunt for stops that meet the specified conditions.
I can't speak for other centers, and can only make observations based on where I am employed: our PDS is stressed to the max, and on some days, can barely hold on to their sanity; this floor stop rule is not inherently bad, but it is just one more thing to do that they do not have time to do. Problems resulting from this rule may be contributed to by the fact that most PDS' have similar problems as our own, or that they are not totally comfortable with the dispatch software which, in my limited experience, is a Matryoshka doll of spreadsheets, charts, tables, etc .. and is not necessarily the most user friendly program I've ever used.