If u only speculate, you may never become lucid in a dream. If you follow your conviction that it is a dream, at least then you are lucid. Dream control may be more difficult to master because you may still feel you are awake but you are lucid nonetheless.

Novakz that is a good point. I would say it is still true. What you experience in a dream is a sensation that everyone is experiencing the same reality. Believing that sensation perpetuates the illusion. At best we can say we experience an impression. With practice you can actually directly choose which impressions and sensations arise.