Earlier quoted context omitted.
Stablecoins have 4-6%apr yields. much better than my other savings.
This statement makes no sense. For a start, stablecoins provide no yield. What you can do is lend your stablecoins and obtain a yield, in the same way that you can lend any currency. The yield is provided by the borrower. Second, the expected return on an investment doesn't tell us whether such an investment is better than another. In order to compare investments, we have to look at the risk-adjusted return.
The risk-adjusted return is just whether the contract gets hacked or not. You get a yield for providing liquidity. Granted that yield might be 4-7%, but it's not risky in the traditional sense of i could 'Lose' a percentage like i could with stocks. I have confidence that uniswap isn't going to get hacked, but do i ever have confidence a stock is only going to go up?