In other words, are there official examples, such as a table, of DC 30 proficiency tests that use skills, for each skill?
I'd love to see what are the upper limits of a character's potential for a skill, but I'm having trouble finding references to it.
Simply put, I understand what athletics does, but I'm not sure what the maximum potential for an athletics control (around 30) would do.
Preferably, I would avoid static / scaling examples from the book, such as how a dexterity (stealth) can be challenged against a wisdom (perception) to hide. These can be applied at any level and are not unique to a DC 30.