I haven't thought about (or even seen) Koss headphones in a long, long time.
I looked them up and they still sell the same dorky https://koss.com/collections/utility-series/products/porta-pro-utility they always did.
It is interesting that Koss happened in Milwaukee, of all places.
I've actually become a fan of light, old school headphones (or ear buds).
They work, they don't need a dongle, they're light, and honestly at this point $9 headphones sound about as good as $50 headphones.
If they break you can find another pair almost anywhere.
Obviously this is all for portable stuff - if I'm editing audio/video I'm going for something much better.