> The more difficult part of playing the guitar is not fingering/picking, it's the fretboard.
I would have said the opposite. The fretting hand only needs to press onto the strings in the correct places whereas the picking hand is responsible for all the subtlety of expression in terms of how you attack the string.
Saying this as a professional mandolin player fwiw.
While true - left hand changes position all the time and has to go on the correct frets all the time - right hand is gentle and subtler, I agree, but is also a lot more forgiving.
I would have said the opposite. The fretting hand only needs to press onto the strings in the correct places whereas the picking hand is responsible for all the subtlety of expression in terms of how you attack the string.
Saying this as a professional mandolin player fwiw.