I think it's inherently wrong that the MMDA was given full control over this issue.

At the core of it the problem is economic. Having a lot of cars and thus traffic is actually a good sign that the economy is doing well. But the MMDA is only focused on the single aspect of traffic.

So let's say they are able to reduce the volume of cars by implementing a full odd-even scheme, but it comes at the expense of slowing down business.

The reason we want cars to flow faster is so that people can go about their business faster and make more money for the entire country. With super-draconian vehicle reduction methods instead of doing their transactions immediately, it gets put off to the next day... Fewer people going to the malls, etc. Naging self-defeating yung solution.