I am not aware of anyone who has tried a modern hardware wallet that still argues that crypto self custody is above the abilities of anyone technical enough to use traditional online banking.
Once they use a pen to write down the 24 word backup then they can simply write it down a second time, or a third. Store a copy in a safety deposit box or anywhere resistant to theft or fire. Easy.
Anyone that can store paper stock certificates can do this only with these the copies are valid.
Also the problem with duplicate hard wallet backups is, if I'm understanding it correctly, a thief can take any one of them to access the crypto?
If so it's a tradeoff, redundancy against increased risk of loss...
Now if someone has an electron microscope and can read the raw memory cells, that is another matter, but not your typical adversary trying to steal for a quick buck at a pawn shop.
It is also more durable because gold you can only store in a single location, whereas with a hardware wallet you could put you 24 word backup somewhere hard to access, maybe spread across one or more safety deposit boxes.
Then if your funds ever feel at risk, you can simply erase your hardware wallet and go on vacation with confidence knowing you can trivially restore it when you get back with a trip to the bank.
That said, as the post I was responding to mentioned there are definitely people who absolutely do store gold.
Home robberies and floods do also occur... and those things can take out offline hard-wallets just like they can take out gold.
With Gold someone has to physically come to the location I've stored it in, that necessarily limits my attacker set.
With crypto, if I use a hot wallet the whole world can attack me. And I know you can use a cold wallets and air-gapping, but now you need to get into managing those well. This is possible but inherently not easy for the average lay-person.
And yep you can duplicate them, and again I look at how many relatively savvy people have DR incidents where they don't test their backups and restores regulaly and get a nasty surprise when they try a restore and realise they got corruption.
All to say, it's possible sure, but I'm not sure for non-specialists I'd say it's a lot easier than gold.