Should it be used or is it garbage?
I'd far rather someone have fun experimenting with expired film than throwing it away.
That said, the real answer is "it depends". Most of us will have used B&W film a decade or two expired and found that it's performing as new, or certainly good enough to shoot at box speed or one stop over exposed and still get excellent negatives. Some films such as Verichrome Pan seem to be indestructible.
In all other cases, including colour film more than a decade expired and very old B&W film....it can be a crap shoot. It can also be fun trying. And one can get a sense of satisfaction from getting any kind of image from film 50+ years old.
Other than the recent Analogue Wonderland film, which was clearly advertised as a gimmick to celebrate their anniversary....which very expired films are respooled and sold as a specific product? I'm not familiar with that segment of the market. But clearly there's demand.
And it absolutely can be an artistic choice to shoot with expired film. I personally don't like expired colour film beyond 5 years it's date as I'm not a fan of the colour shifts. But others are, and that's totally cool. Additionally, I know some colour films are fine 10-15 years expired. My local shop discovered some proper Agfa Vista in it's basement 5 years ago, and I snapped it up at £1 a roll because I knew it would be fine. And it was.
I wouldn't say that aged film is imbued with magical properties, but it is different to fresh film. And there are people who want to work with that....so why not let them? It does nobody any harm....regardless of whether they find it in an attic or buy it from a vendor who's acquired a warehouse of the stuff. If someone gets something out of shooting it, that's far better than dumping it in the rubbish.
