This isn’t meant to be an update to Simpson-Bowles 1.0. Rather, it’s meant to be an outline for a new grand bargain. To that end, Simpson and Bowles began with Obama and Boehner’s final offers from the fiscal cliff deal. That helps explain why their tax ask has fallen so far: Obama’s final tax ask was far lower than what was in the original Simpson-Bowles plan, while Boehner’s tilt towards spending cuts was far greater than what was in the original Simpson-Bowles.As he also describes, the actual policies used to achieve these targets haven't been revealed (other than Chained-CPI).
There is a lot to be frustrated with about this type of proposal. As Greg Sargent notes, this will be referred to as a "centrist" position even though it is far to the right of their initial "centrist" proposal. This moving of the goalposts punishes the Democrats for being more willing to compromise, while rewarding the Republicans for being less willing to. But I think one thing worth mentioning is the sheer lazyness of the proposal.
There is room in our political debate for a group that outlines a proposal that falls roughly in the middle of the two major party's bargaining positions. But the role of the group needs to be actually outlining the proposal. Simply naming the middle adds no value whatsoever. Naming actual budgetary changes is difficult work, and legislators would benefit from non-partisan groups identifying and scoring these changes. Similarly, identifying different potential budgetary changes and computing and publicizing their distributional impact would help the public recognize what these changes would actually mean. But Simpson-Bowles does none of this. They simply point out "the middle" and then go on Sunday shows and scold politicians.