Not necessarily so...my dad told me that some of the new regulations passed without too much attention is that ammunition now expires after a certain date...meaning the ammunition that is made now is formulated to last for a certain period of time.
We need to use it before it gets stale then.
Your dad may have been misled.
The assertion has also been made here by a former employee of a primer manufacturer that they were approached by the feds to make primers with a short shelf-life.
The response was "We've spent the last century making our primers reliable and long-lasting - we're not about to turn that around".
A patent has been filed (and perhaps granted) on expiring primers, but I don’t know that anyone is making them, and I’m pretty sure there’s no law in any jurisdiction requiring their use.