Unintended side effect might be that congress would use their power to make bonds a more profitable avenue of investment, creating a very reliable, high-interest retirement vehicle for average people (rather than getting into the roulette wheel of the stock market). Imagine if USG-backed 15% treasuries were a thing?
Where do you think the money for those 15% interest payments would come from?
There are historical examples of what happens when lawmakers mandate high amounts of money creation. It doesn’t end with the people being better off. It usually destroys the economy.