Mental bandwidth is not just purely down to the decisions you make for yourself, do you think working in McDonald's is not a stressful way to spend your day? These days I have a pretty high stress job, but I know which rile I'd rather be doing.

You also have to remember that for many people in a service role, that might be the only job they could find and they don't have the chances we do to pick and choose roles based on interesting projects.