Awareness – One of the Key Factors in Playing the Piano
Briefly – you can only knowingly change things that you are aware of. But any kind of development needs change and mostly intelligent change. So without awareness there is no intelligent and knowingly directed development.
Even if you improve through unconscious practicing – how can you be sure that the skills (they would be mostly mechanical here) would remain in time if you are not aware of them?
In my opinion awareness is the key to constant and stable development process.