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human
ELI5: Why is the seemingly more complicated part of playing the guitar done with the non-dominant hand?

When a right-handed person plays guitar, they typically use their right hand to strum the strings while manipulating their left hand on the neck to adjust notes and chords (or something; I’m not a musician). It seems to me the fingerings along the neck require more dexterity than the strumming and would be easier to do with the dominant hand.
gpt
If you try playing guitar the opposite way it becomes pretty obvious that the strumming is actually the more difficult part. Much of the time you’re just forming your off hand into the correct fret positions to play chords. Even if you’re playing more melodically or a solo, it’s less difficult than you’d think to move your fingers around, and you have the neck to guide that hand if need be. 
Strumming and picking end up taking more control and effort so your dominant hand is better at it.