Competing very effectively in many cases.

I personally have not seen that workaholic employees get consistent preference in workplaces. Often they get shafted the hardest, particularly in highly competitive workplaces (where, for example, supervisors may undermine their best employees who might threaten their own ambitions).

And the hardest workers are also prone to burnout, which often leads to catastrophic career failures: quitting suddenly with no backup plan, changing careers, having a breakdown and ending up nonfunctional for months at a time.

I have worked in a variety of workplaces, some that were circling the toilet, some that were leading their industries and nonetheless still shooting higher, and some that thought/hoped they were the latter but just didn't have what it takes.

The most consistently successful companies I've worked for have their employees work like tortoises, not hares. They want us to work hard, but sustainably. They discourage all that hypercompetitive nonsense that rewards backstabbers over hard workers, and they encourage us to have a life outside of work to keep us sane. They do this not out of the kindness of their hearts, but because they are insatiably greedy and focused: they want our next 20+ years of productivity and experience.