What is dysfunctional, controversial, or negative about Epic skill checks?

I often see it said that the entire Epic Level Handbook should be dismissed as broken and frequently dysfunctional. However, outside of claims that the entire book is bad, I never see Epic skill checks listed as an example of something negative, controversial, or objectionable. The only near example that I can think of is Diplomancy, but that’s an issue that was largely inherited from Core. There are of course some absurd examples like the Arseplomancer, but Epic levels are all about performing absurd feats of skill.

This leads me to my question – it is frequently said that the entire Epic Level Handbook is bad, but what specifically is dysfunctional, controversial, or often seen as negative about Epic skill checks?