Because the 'simple straight forward explanation' doesn't make much sense.
As economies grow and expand, they need more money supply to keep prices stable. If you're using 100 tons of Gold as your 'fixed money supply' then you run into deflationary problems.
Also, if there is a crisis in which people get really anti-liquid and tend to hoard and do other bad things, and/or the system needs to allocate resources somewhere fast or else face destruction - then if you only have a big pot of gold split between owners, you are screwed. Mad Max style. If a country is invaded or has a pandemic, most regular levers may not work. But helicopter money can help. It implies an 'unfair' re-balancing of who owns what, but so long as the community at large accepts that, then it's fine. It means a price adjustment for everyone.
As economies grow and expand, they need more money supply to keep prices stable. If you're using 100 tons of Gold as your 'fixed money supply' then you run into deflationary problems.
Also, if there is a crisis in which people get really anti-liquid and tend to hoard and do other bad things, and/or the system needs to allocate resources somewhere fast or else face destruction - then if you only have a big pot of gold split between owners, you are screwed. Mad Max style. If a country is invaded or has a pandemic, most regular levers may not work. But helicopter money can help. It implies an 'unfair' re-balancing of who owns what, but so long as the community at large accepts that, then it's fine. It means a price adjustment for everyone.