Comment by crazygringo

Seriously, I hate it.

I understand why it happened -- it made sense to allow PDF's to be used for form-filling, and once you can fill in forms it obviously makes sense to validate inputs, and to handle arbitrary validation complexity you need a scripting language, and obviously then you want to be able to automatically fill in fields based on other fields, or even produce a QR code so it can be printed and scanned... And they didn't want to create a new extension like ".ipdf" for interactive PDF.

But still. I hate it.