I don't agree with this. Just as in a combat encounter, players of 4e have a lot of resources they need to think about spending, and they can't do this sensibly without a general sense of the mechanical context.The secret of a good SC is to craft it in a way that the players don't really know they are in a SC
The OP of this thread discusses this. That's really the raison d'etre of the thread!I also think the best skill challenges involve some sort of real "progression". If your scene is static, its often best to just make a few rolls and be done with it. SCs work better in things like chase scenes where the action keeps moving, prison breaks where you are moving from one area of the prison to another. A diplomatic skill challenge is best in a large party settings where you are moving from one NPC to another learning bits of info, rather than just sitting down with the duke and throw down Persuasion checks until you hit your magic number. Ie there needs to be a narrative reason to roll more checks.