That is a very, very good suggestion!
I do exactly the same thing. I create a separate showfile per day. If the result was good, it becomes the new reference for the respective band, otherwise it is deleted after some time.
I try to keep the number of showfiles on my Surface as low as possible. Because I don’t do this every time I switch off, I have to remove several shows again and again.
On the computer it’s easy, you just open the folder and delete what you don’t need anymore. But on the Surface, you can only delete one show at a time, which can be a bit annoying depending on the number of shows.
The possibility of marking several shows for deletion would be very helpful here.