Totally agree — this is a minor (like 1 line) code change, could easily be incorporated into a subsequent firmware release. The sight overlap of capabilities far from unique, and a “daily” (i.e. 1-day interval) watering pattern is pretty usual stuff.
As a long-time developer, I honestly do appreciate the purity of the “no overlap” school of thought. But I’ve since spent decades working with UX design teams who’ve convinced me that the user’s convenience is more important.