I had just reread the Rules Compendium's rules for scaling DCs. Tell me if I have this right.
Rules Compendium, page 126: "When choosing a DC from the table, the Dungeon Master should use the level of the creature performing the check, unless otherwise noted.
"Level 4: Easy DC 10, moderate DC 14, hard DC 21
"Level 5: Easy DC 10, moderate DC 15, hard DC 22"
Page 132: "Acrobatics: Escape from Restraints: DC: Hard DC of the creature's level."
Page 135: "Arcana: Identify Magical Phenomenon: DC: Hard DC of the phenomenon's level. If it has no level, use the hard DC of the creature's level.
"Arcana: Sense the Presence of Magic: DC: Hard DC of the creature's level."
Page 147: "Insight: Sense motives or attitude: Moderate DC of the target's level.
"Insight: Sense outside influence: Hard DC of the effect's level.
"Read the mood of a crowd (easy DC)
"Discern who among a cagey group is the leader (moderate DC)
"Interpret enemies' hand signs (hard DC)
"Recognize a creature as illusory (moderate DC of the effect's level)"
Is there any rhyme or reason to what DCs constantly scale based on a PC's level, and what DCs are keyed to NPCs' or external effects' levels?
It is sensible enough that identifying magical phenomena, sensing motives or attitudes, sensing outside influence, and recognizing illusions is based on NPCs' or external effects' levels.
However, it is completely bizarre that many other tasks, like escaping from restraints, sensing magic, reading a crowd's mood, discerning leadership, and interpreting enemies' hand signs is based on the PC's level. In some cases, like when going from level 4 to 5, the PC might actually find the task harder than before!
How should one make sense of this? Is the Rules Compendium simply being obtuse and always assuming that PCs are always in a level-appropriate challenge? If that is the case, then why does the Rules Compendium explicitly note when a task's DC is based on the level of an NPC or an external effect? How does this work?