Just for funsies, I've grabbed the PCs from the last 1-30 game I GMed. I have just stray copies of them at various levels (I have the Rogue at 12, the Bladesinger at 20 and 30, then the Druid at 30 only).
Here is what a level 20 Bladesinger can bring to bear against an Epic Tier Skill Challenge. My Skill Challenges would run "of level" (normal), level +1 (hard), level +2 (very hard). Here are the DCs for those:
Level Easy Medium Hard
20 18 25 34
21 19 26 35
22 20 27 36
The overwhelming % of DCs will be Medium with 0, 1, or 2 DCs hitting Hard depending upon Complexity (I rarely used Complexity above 3, but I did in some cases).
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That is a significant ability to hit the Medium DC for a very wide swath of obstacles. Then you have to consider the following resource suites they could call upon to broaden/amplify their Skill Challenge capability:
* Mage Hand (AW) where minor, ranged legerdemain could aid against a challenge granting a +2 bonus
* Flowing Evasion (E) for movement-based challenges where pursuit/acrobatics/grace/slipperiness are in play granting +2 bonus.
* Mighty Sprint (E) +5 bonus to Athletics when speed and/or jumping are relevant to the obstacle.
* Legend Lore (E) to sub History for Dungeoneering, Nature, Religion checks.
* Spook (E) to sub Arcana for Intimidate.
* Suggestion (E) to sub Arcana for Diplomacy.
* Fey Step (E) for automatic 1 success when bridging a 25 ft gap is the obstacle (or to use as auto secondary skill buff +2 to help allies cross).
* Philosopher's Crown (D) to reroll Arcana, Dungeoneering, History, Nature.
* Endure Elements (R) for 1 auto success when exposure or severe conditions/phenomenon are an obstacle.
* Pass Without Trace (R) for 1 auto success when leaving no trace of your trek through wilderness during a perilous journey is an obstacle.
* Warded Campsite (R) for 1 auto success when you're camping in the wilderness (this also ensures no nested combats happen as a result of a consequence of such a situation).
* Phantom Steed (R) for 1 or 2 auto success when travel over great distances is an obstacle for you and your allies.
* A whole lot of Coin to grease palms, attain physical assets, or purchase the aid of Companion Characters/Cohorts for either auto-success in an SC or persistent bonsues/help for combat/SCs.
That is what the capability of a PC entering Epic Tier looks like in terms of noncombat capability. Even though Hard DCs got progressively more difficult to accomplish, they weren't common, you're reliably hitting the Medium DC on a huge swath of obstacles inherent to your thematic archetypes, and you can marshal auto-success against a wide variety of obstacles (from Dailies, to Rituals, to using Coin for assets, hirelings, palm-greasing).