Gresham' Law per definition needs a State which allows different types of money.
What we see here is nearly the same. When people have two coins, they always hold the coin back which is more sound. This leads to a even faster devaluation
First darknet markets, then CoinCards, now ShopinBit. nostr:npub1vr2nva0s0hhfulthjy8053rg9kruk5erzwaxdw85gjwkfytj994sgudzvx next?
Are we supposed to ignore this or just rationalize it with "muh Gresham' Law"?

Gresham' Law per definition needs a State which allows different types of money.
What we see here is nearly the same. When people have two coins, they always hold the coin back which is more sound. This leads to a even faster devaluation
I wouldn't save in XMR.

Would you spend in XMR?
Depends on what I'm buying. The same answer as if you had asked "would you spend in BTC?"
Then what you save on is besides the point when discussing merchant adotpion. Replying with xmrbtc charts and variations of greshams law is just ignoring the real issue and the clear market signal.
It is an important point about the limits of exactly what is being said by that market signal.
No one is disputing that. All aspects are important. I see a gold/silver dynamic at play here.
Nothing wrong with using silver for payments.
My thinking was more like the era of gold and gold certificates. We will never see them pegged, but the gold certificates were probably never a true perfect peg either. Atomic swaps are already here at a floating rate.
So... "muh Gresham's Law". Bitcoin losing retail payments is not something to brag about IMO