Major chords are simple and easy to play since all the chords can be played with a straight finger
It is great for beginners, children, handicapped people, arthritics, and people who simply have no time to take on classical guitar instruction, as chord shapes are easier allowing beginners to play songs faster
Beginners who learn in Open C tuning find the one finger barre chords great practice for the more complex barre chords they may go on to learn in standard tuning
The tuning has fewer notes within it eg there are 3 C notes , 2 G notes and one E note. This allows scope for 2 or three octaves of the note to be played at a time
The logical and simple arrangement of notes means that you can find nice sounding patterns easily
Scales follow a simple pattern and are incredibly easy to work out on the fretboard and play. If you know the chords, you know where the scales are, and you can find the notes for the solo, and vice versa.
If you know basic piano theory this translates really well to guitar and gives you more options. The reverse is also true. Once you learn a number of songs and get familiar with this style, you can translate this back to the piano as well.
Playing by ear is easier and it is possible to play in this tuning with no complex theory or prior knowledge. You can hear if the next chord is simply higher or lower than the one you are on.
Harmonics all sound great as they are all aligned in C major. The easiest harmonics to play are found at the 7th and 12th Frets
Open C tuning takes great advantage of the open strings which can create a droning effect.
Easier finger work means you can focus instead on your strumming patterns and singing.
Using a capo makes it very easy to reduce the effort even further by barring the lowest chord, or change the key entirely.
Learning new songs and achieving faster results builds confidence and interest which are required to maintain this skill. In the standard tuning, one may drone on with exercises and simplistic songs for a year or more before it even gets interesting.
Most stringed instruments are tuned into an open tuning configuration. The tricks and techniques you will learn with Open C tuning are often directly transferable to instruments such as the Mandoline, Violin, Banjo, Dulcimer even the Harmonica.
Other people who only know standard tuning methods will Not be able to play a single thing on your guitar unless you decide give them a quick lesson.
If you play in Open C, you no longer need to retune to play those Drop D songs. Open C tuning accommodates Drop D tuning. If you have learned any Drop D songs, you just transpose those up 2 frets and play as normal.
There is less string tension on the strings and the neck of your instrument. This makes it easier to push down the chords / notes and preserves your strings and your instrument.
You can re-tune any stringed instrument to Open C, and directly transpose everything you learned to the Banjo, Mandoline, Ukulele, Dulcimer, Violin etc.
Open C is a very common slide guitar tuning, and sounds very beautiful when played with a slide.
A skilled player can often play the music in such a way it sounds like two instruments.
Open C gives the guitar two more lower bass positions C and D that standard tuning cannot access.
Many of the main chord shapes one finger or otherwise are moveable up and down the neck, which makes them easy to remember and fast to change.
Once you know the One Finger Method, and you can play by ear, you can easily teach it to friends, family even hire yourself out as an intermediate guitar instructor, join a band, the sky's the limit!
Understanding the annotations I use to write out the chord positions takes just a few minutes. There are no complex acronyms to remember or daunting symbols to learn. The number, is simply which fret to put your finger on.
If you find yourself in a creative rut or plateau, Open C tuning and the One Finger Method of playing can open up an entire nearly uncharted ocean of creative possibilities.
