We have mentioned before the power that the triad-chords have in playing and unlocking the full fretboard of an instruments like ukulele, Bouzouki, Bass etc
We apply it here in understanding the standard tuning of the 6-string guitar as an hybrid of a bass (at the lower 4 strings) for bass-melodic -lines and baritone ukulele at the higher 4 strings for easy and plenty many triad-chord shapes.