Ralphie, all guitar tunings are fun.
more to the point, is to get a little understanding of what you are doing, messing about with a7 shapes, can be fun, but it only gets you so far.
the best way to understand a tuning[ imo]is to draw a diagram of the fretboard, and fill out the frets with every note,by doing this you can see all the possibilities, all the different chord or dyad inversions, this applies whether it is cgcgcd, dadgad, or standard or what ever. .   that is the best way to get your head round anything by understanding what you are doing, and then practise a lot.
in fact the concept of a lot of open tunings are the same,
1. the sympathetic ringing of strings,
2. the use of dyads and chords that avoid to some extent the note that determines whether the chord is major or minor
3. the deliberate use of doubling certain notes.[OFTEN THE ROOT AND THE FIFTH]
4.The use of counter melodies or single harmony lines, using sparse drone harmony, and the avoidance of chords involving major or monor thirds and added jazz discords , [though to my ears] suspensions are sometimes used, but generally without the note that determines wheter a chord is major or minor being present, so often there is a much more ambiguous flavour to the chord, after all cgcgcd tuning is a c modal9 chord or arguably even a gsus4 tuning, the removal of the note that determines major or minor, also[imo]can give a rootless feel
   however open tunings do have certain limitations, they are not generally as useful as standard tuning, when it comes to playing music that modulates a lot such as rag time.