I do not dispute the fact that the Ledger nano S has been discontinued, which is absolutely natural since they are replaced by the nano s plus model, but they still receive firmware updates.
So does Keystone previous version.
It is more likely that ledger will soon stop updating ledger S, because they announced it themselves.
But if you like using ledgers old closed source junk, go ahead and do it, your choice.
You also write about the low price of the Keystone, but I bought my Keystone Pro for $169 and pretty soon I'll have to throw it in the dustbin. I also want to remind you that they previously released one of the most expensive wallets in the world
Cobo vault worth $479, which someone probably bought and already threw in the trash.
Keystone always had a lot of discounts and promotions.
I never said they are cheap or cheapest wallet in the world, but they are airgapped open source devices with fair price.