Achan hiArusa
Explorer
You can, but I think there's a conceptual difference at work here. With the table, you look for a difficulty set to the characters at their level and come up with the rationale afterwards to justify the DC. Ruemere, I think, prefers the opposite direction - set the DC appropriate to the specific case, don't worry about what's on par with the PCs' level.
For some people, it's like the tail's wagging the dog to do it the 4e table way.
I think if you do it the second way, then you can still use the table. You just make the encounter, set the DCs for the specific case and then use the table to find out what the CR of the challenge was and use that to determine how many XPs they get for the encounter.