I’d split it up into:
a) conscious thought is at the practical level of awareness.
b) subconscious thought is at the brink of awareness and can be apprehended but only with low latent inhibition or with training.
c) unconscious thought isn’t really thought in the same way as conscious thought, as it’s generally out of reach. But through training it can at least be brought to a subconscious level and apprehended there.
Are there processes to which we will never have access?
Probably. But to leap to having no control at all is a bit much.
Also, if you are aware of how the unconscious processes work, I see no reason you can’t use the anticipatory abilities of the brain to PREDICT how your unconscious processes are going to behave, which allots you a level of control over them to correct and retrain.
The only time in my life it wasn’t there was two weeks on Wellbutrin. All the inner stuff just “stopped”, basically. It was as if my inner autobiographer died and stopped continually narrating and showing me things from the inside.
I don’t remember much from those two weeks.