I noticed this just today. It automatically re-wrote in prior years. 

I actually agree with you. Its extra steps that I find annoying. I use the PDF to print my returns only, I used to print directly from within PS but found it was taking MUCH longer to do so, so I moved over to PDF. 

I talked to my IT and he said it is a PS change and not much I can do (I thought maybe there was a setting I missed). He also agrees with most that this should've been done a few years ago. 

PIA but it is what it is. 

PS: maybe delete files once a week within ProPDF?