It actually is capitalism, specifically post-industrial capitalism.

Medieval peasants actually had a ton of free time

Hunter-gatherers have even more free time than farmers do

Meanwhile, in developed countries, we often get to spend hours each pretending to work if we're lucky enough to not be in a Retail/Fast Food job that makes you stay standing for hours at a time while you face the whims of the customers.

If no one got "stuck in a dead end minimum wage job" society would literally collapse. You need to stop seeing these jobs as a failure of the person who has them. These peoples lives being shit are a failure of society unable to properly compensate the people who make our lives possible