Users are fully exposed to the price of the underlying asset
If too much liquidity is being unlocked at once, it will create a huge difference in the selling price - High slippage
Risk of THORChain failure
No Impermanent Loss
Impermanent Loss happens when the price of the deposited assets changes while providing liquidity. This doesn't happen with THORChain Synthetics as you are providing only one asset.
You are always able to withdraw
Less $RUNE in the pool means a higher price, thus no matter how much $RUNE you withdraw, there is always a sufficient amount of $RUNE.