Open tunings work well for pipe tunes or others which suggest the need for a drone of some sort.

I think it was Leo Kottke who first blew my mind with open tunings and I still use open G a lot (or open E on my baritone guitar, BEBEG#B). Also on the baritone I'll use my "F power chord tuning" CFCFCF, though it requires a different set of strings.

I currently have two older gentlemen students with arthritis concerns who have switched to open G to make it easier to play their favourite campfire songs. One and two finger chords abound. Someday I might need to do the same.

Peace, Mooh.