I have been playing chords for awhile, I have big hands and have been wrapping my thumb around the neck sometimes playing some chords. I see some pros do that too.
However, I am working more and more on notes up and down the fretboard and finding that some of my chord positions do not place me in a good position to switch to lead and may be a bad habit?
I read a lot to keep your wrist down and only part of thumb on back of the neck with fingers curled over the fretboard.
Now I think I need to revisit my chords in this hand position so I am in a better position to play lead up and down the neck.
How many think it is best to play with only half of your right hand thumb on the back of the neck all the time? It seems to lend itself to lead better.

'07 Epiphone Les Paul Custom Ebony, '72 Sigma GCS-6 Acoustic, Vox AD30VT, Vox AD30VT XL.