This would allow the candidates and the media to focus their efforts regionally rather than having to jet back and forth over the US. They could do more bus and train stops and spend more time in rural regions rather than doing flybys into the major media markets.
If, for example, the US were divided into eight regions, then there could be one super Tuesday each month for eight months.
Instead we have an ad hoc system developed over time by a series of accidents that is defended by those who happen to benefit by the accidental set-up and opposed by those who don't.
Republicans hated the Iowa caucuses being first when Iowa tended Democrat, but now love it because it tends Republican.
How convenient.