So... Does that mean the quality of a skill attempt should be decided by an additional die roll? Say I roll to jump a chasm and succeed. Now, do I roll a die plus bonus and compare the result with the difficulty of the chasm?
Skill challenges and aid another would be simpler to run. Say there is a mountain and you'll need 30 progression points to reach the summit. Let's say I roll Wisdom (mountaineering) and succeed. Then I roll 1d8 (fine climbing gear)+Wis to see how much progress I make. Every round me and my friends fail to reach the peak the mountain gets to spring a random encounter on us.
That's exactly how some of the Burning Wheel non-combat conflict resolution systems work, and for the same reason. BW calls that total the "Disposition"--when you run out, or the other guys does, the conflict is over. I advocated something similar for skill challenges some time ago.
And it should be noted that you can still use a straight skill check in such a system, when that is all you need for resolution. You want the rogue to climb that 20' wall? Just roll a skill check and bypass the points altogether. Basically, every skill challenge pits you against the equivalent of a handful of "minons"--and is thus about as satisfying.