The problem with "ex ante" regulations governing conduct is you force a lot of wasteful work on a lot of people and companies that becomes a drag on the economy, productivity, whatever you want to call it.
Let's make an analogy that's appropriate for this time of year. Some people cheat on their taxes. Some cheaters get audited and caught, some don't. Since we know that some people cheat on their taxes and an audit will uncover it should we force every tax filer in the US to submit receipts and other documentation for every deduction claimed on their return, at the time of filing?
Can you imagine how much time that would take for filers and the IRS? Can you imagine the outrage on the part of filers?
The Taibbi article sites to a Bloomberg opinion piece that baldly states that people can lie in their pitch and get away with it. However, if you read the legislation (or at least credible legal analysis of it): A) the pre-prospectus presentations can only be made to qualified investors and institutions (meaning you are supposed to be a sophisticated investor, not the general public and will read or pay someone to read the prospectus when it is filed) and B) the actual regulations that will enact the law haven't been written yet.
There definitely will be (and need to be) reasonable regulations to enact this law, I don't argue that at all. I just think the whole tone and content of this article is over the top and biased. I enjoyed reading his evisceration of GS, but I do think it has influenced his writing about anything having to do with the securities markets or finance in general.