It was decided over dozens of meetings with dozens of people, and there are not good notes. Those people are smart and considered more details than you did (but not always the same details). There is rightly fear that if we reconsider this again we will forget one of those other details and some up with a decision that is better for your case but worse overall because it breaks some other case.
Isn't it more likely they just keep on adding little exceptions in order to be able to show they pushed something through for their constituents? That's the impression I got when reading these laws in the first place (a bone for the liberals, a bone for the socialists, ....)
