Reach is a very old mechanic, and has existed at since Alpha's Giant Spider, although it did not have a keyword at the time and was simply spelled out in the rules text
This meant that Blue had "U" and "E" and Black had "C" and "K." (In the early days before Wizards spelled it out, incidentally, some players used "K" for black.) Why did we end up going with U
However, a more interesting part of these releases is that, instead of having one face commander and one backup, both commanders are given equal billing
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For example, if two creatures you control with lifelink deal combat damage at the same time, Elenda's Hierophant's second ability will trigger twice