Basically what it comes down to is that this move will completely destroy trust in western financial system. If the west starts seizing foreign assets without any legal basis, then keeping money in western banks starts being a huge risk.
archived https://archive.ph/LAc9J
I know that they stole the gold that was actually IN Afghanistan. Just broke in and took it. Did Afghanistan also have gold reserves already in the US as well? I wonder how many countries would like to take their gold back but know if they tried the US would just seize it. At this point the US is probably already just holding it all hostage.