Does filament really "expire?"

I saw an article that said 3d filament, ABS or PLA, "expires" after 6 months. Has anyone had that problem? I store mine in a container with a floor of desiccant and I live in AZ, so moisture isn't a problem. If the filament can "go bad" what are the symptoms? How can you tell yours is expired?

With so many conditions top monitor to get a good print, I don't need expiring filament to worry about. This would also imply printed items may "go bad" after a period of time also, no?

Tell me it isn't true.

It will only "expire" because it absorbs moisture.
Nothing a bit of drying can't fix.