ERC-1155 is soon to be finalized, but one remaining contentious point concerns existing smart contract wallet and the general problem of smart wallets supporting future standards.
I assume that they worked out this one remaining point.
So, ERC-1155 is final, yay!
This is not a problem with tokens standards, it’s a problem with smart wallets not being upgradeable. Once you provide a smart wallet with upgradeability mechanisms, this is no longer an issue.