No, it doesn't, if you by old school means formatting all the time.
Then old school deletes the files and folder structure I want to keep on my cards. Formatting would require me to re-create that data on the card each time, an unnecessary process that's likely to be forgotten or introduce errors which don't need to happen.
The only disadvantage deleting all images instead of formatting has is that it's slower. But I choose to do it when I'm not in any hurry, so that's not much of an issue.
So just because the formatting way works for your way of working, Mike, it doesn't mean it works for everybody. It depends upon what you want to accomplish. For the OP, as well as for me, it's clearly inferior to using the delete all images command.
OK.. question because what you are talking about is greek to me. Are you creating folders on a single card ?? then putting images on the card to those assigned folders ?? Have not heard about this. I have always done it Old school for the past 8 yrs so didnt know you could create a set of folders on a card....The advantage would be V/s the old way v/s cameras with dual cards ?? Trying to see why one would consider doing what you do here.