[zamadatix]

EDTF has advantages in less ambiguity. At the same time, Markwhen does also support non-EDTF dates too. The docs do a good job of explaining both https://docs.markwhen.com/syntax/dates-and-ranges.html

Personally I think it goes a little over-flexible on support for non-strict formatted dates to the point it becomes difficult to figure out what a given date string is going to result in rather than feeling easier to use. That's probably part of the reason the primary example uses the clearer format.