I'd argue that it's not human nature but rather our socio-economic system that keeps us grinding away. It's become obvious that for the most part automation does a disservice to workers rather than liberating them since they don't have the legal ownership of the automating forces. A typical factory or whatever if it is able to automate 20% of the current work being done will simply lay off 20% of its workforce rather than reduce everyone's workload by 20% while maintaining their wage.

Now this creates a bit of a crisis since the automated production produces things that need to be bought by the workers they displace, who now no longer have any money. The outcome as I see it is an extension of credit systems and the propagation of tedious nonsense jobs (ala Graeber's Bullshit Jobs).

In order to bring about the ideal of automation creating more free time for all without diminishing their income you'd have to transfer ownership of the automating forces to the workers they're replacing. But then I'm just a Marxist looney so what do I know.