Why can we only have 1 registered chocobo for racing?

This completely makes no sense, why can't we have for instance our P9 chocobo for R300 races for MGP purposes (higher tier races give more MGP), and then another chocobo for R60-120 which is where you clearly have the most interaction with real players because understandably, most people can't be arsed to go through 8 breeding generations. Why can't we have this???
Is there something I'm missing here? Why this silly restriction?

I would like to see this changed somehow as well. I would like to have multiple chocobos with different stat allotments and abilities that I can choose between for each race. It depresses me that I could make the perfect endurance Chocobo, but never be able to breed the perfect max speed racer without giving up playing with my endurance Chocobo forever.