I do agree that the process of learning to see, and expressing a thought improves me as a person. Opens my eyes and makes me more aware. That's why I would continue making these photographs even if no one saw them but me.I will disagree that you wouldn't have accomplished anything.
But I should clarify my statement. Let's change it to "I wouldn't have accomplished what I feel that I want and need to accomplish." I would see it a bit like spending a lifetime gaining wisdom and insight, gathering wonderful experiences and learning volumes from them.... and never sharing any of it with another soul. What a loss that would be!