Let's say a very bad case of bad luck and every time and every laptop you try to use to read any of those USB key it breaks them. What then? How confident would you feel when the second one is already broken and you still didn't manage to make more backups? Yes, I know, it's extreme... Still, I recommend some physical means too as backup.
Well, this is highly, highly unbelievable scenario to happen, nevertheless I have took it seriously and to prevent it I will buy in the nearest future USB tester to control voltage on D+ and D- lines. Have seen this stuff recently on Amazon, the price around $50 is not to worry about. Thanks.
P.S. In this scenario applied to my setup, USB pens with Tails would get damage first, rather than HW pgp keys.
We are in 2024. USB is still widely used, but various flavors tend to change the trend. I would not be surprised if in 10 years already the USB port will not look like now. I expect USBC, for example for the port. Plus: 25 years ago CD/DVD was a thing, now it's no more; are you sure your kids or nephews will know - when the time comes - what to do with an USB stick? Will you be sharp enough in 20-30 years to change the storage (from USB stick) to something that will be then "in trends"?
Should USB replaced by new interface my private pgp key can be easily ported. HW is just a holder of that key.
BTW, two of my HW keys have NFC interface alongside with USB.