The reward for increased productivity is more work!
The problem for the capitalist is having to pay all those pesky people to do the work. Eats into profits. Now we can burn out 2 people and do the work that used to take 10!
This but un-ironically! Politically it is hard ti support UBI. But print a $10k stipend for every person because the economy is tanking is obviously palatable. It is always seen as fine if you fix a problem in retrospect and without a tax rise. Money will eventually be like Robux.
The problem for the capitalist is having to pay all those pesky people to do the work. Eats into profits. Now we can burn out 2 people and do the work that used to take 10!