In the UK, if you are unlucky enough to get a payroll audit they go straight to reviewing expenses for things that should have been taxed, so yes you end up adding friction to the claimants to stop that happening.
Fiber One bars have extra fiber, but ultimately they really are just glorified candy bars, not radically different than a dessert. I don't see how this was significantly than ordering a dessert at a restaurant.
They did not spend hundreds of dollars in labor to save 5$. They spent hundreds of dollars in labor to avoid committing tax fraud while soothing your self-admitted petty ego.