The amount of work left to do is massive if you stack up all the unsolved problems and potential R&D, like diseases with no cure of that we don't even begin to understand. We could choose to simply stop new R&D, but as long as there continues to be suffering from those unsolved problems it's in our nature to continue to try and solve them. And it's in our nature to prevent the free rider problem, where people expect to benefit from the solutions without contributing.

This is fine. But companies seem to not have a control lever for employee wellbeing. If humanity works to solve problems, don’t you think overwork is also a problem that needs to be addressed?

Capitalism is designed to have a lot of free riders. Anyone with sufficient capital not to work is free-riding by design (if they choose not to work).