The problem with this line of reasoning is you’re assuming everything required to keep a company going can be reduced to a job description, but there’s millions of small, impactful ways employees can contribute that fall through the cracks. Being pleasant to your coworkers is rarely part of the job description, but it can make or break that coworker’s productivity for a whole day.

If you aren’t willing to do these extra tasks, that’s fine, but you’re doing nothing to keep the company surviving and someone else will have to pick up your slack. It’s in everyone’s best interests to keep the company surviving as long as possible so it can keep paying salaries.

Of course the C level has a lot more to gain, but everyone has to work somewhere so why not do your reasonable best to make a positive impact.