What do you think is the most stressful/complex aspect of HR (besides dealing with conflict)? [N/A]

What do you think makes HR complicated/complex/stressful (aside from the “people” part)? What I mean is from an administration perspective. Do you find the administrative/paperwork parts of it difficult?

I come from an accounting background. It’s virtually no “people” problems but is very demanding. It’s very dry but high pressure. Lots of tight deadlines, complex concepts, very granular work, one tiny mistake can cause a ripple effect that throws other accounts out of balance, etc.

So that said, what do you find the most “complex” to understand about HR?