It can be intruding if you are doing it for the wrong reason. Please understand I usually do it because the person i am walking in their dream is someone close to me who is "calling me" because they need help. They may be struggling in their dream or having a rough go with something in their life that it is effecting their sleep. So I am called into their dream. I have only once ever entered someone's dream without them 'calling me'. Again I dont recommend that unless you know what you are doing or you as the dream walking can be very draining and unhealthy.
As for what the point is, to help someone when they are sturggling. They dont know its you there in their dreams but they can feel a presence. Which inturn can help them feel more at ease in their dreams and work through what they need too. My reason is always to help! I am not selfish and would never use my gift for my own purpose or gain. I also dont take what I learn in a dream walking situation and use it against the person either. Most people I have dream walked into are either close personal friends of mine or family members. There has been 2 cases where it was a complete stranger to me. One time I was called into a dream and I didnt even know the person. They some how were so strong in their signal (if you will call it that) that I was drawn into their dream.
My uncle is a medicine man, in my culture. He is my teacher and he walks in my dreams when I am personally struggling. I am aware tho he is there. I feel his presense and I have actually on a few occasions have even seen him in my dreams.
I hope this answers your question Asghar.
