Yeah I know but it can still cut ya short when thinking of the guitar mixed with other instruments. There's just more to it than just avoid doubling the root note. It's a good thing to double the root if it happens to be the tonic, subdominant, or dominant note in the key. Same thing with inversions, take a ii chord in first inversion (which is the sub-dom note). The sub-dominant note is then doubled, rather than the root. So here you might find the bass player and the guitarists doubling the bass note. You also can't always expect the bass player to just play the root, especially in jazz. So I wouldn't just avoid doubling the root in the chord, but instead do so and let the bass find the inversion on some chords. Especially if it's a melodic step from the last chord. Think of it as what you can do not what you can't do. You can leave the root for the bass player, not that you can't doubled the root in the chord you want.