@fireproof78 , I agree wholeheartedly and I think you and I have a different interpretation about meaningless than others in this conversation. Its very clear, at least to me, that Luke's ForceSkype attempt was, not only a mirror to Poe's distraction at the beginning of the film, but also served to prove him as the greatest of all Jedi.
His act of sacrifice, not only was far from meaningless, as it allowed himself to be something in death he could never allow himself to be in life: a legend. Because of his arrogance. Because of what his actions showed as consequences for the rest of the galaxy. He died, not in a moment of weakness, but in a moment of pure strength, saving his sister and what was left of the idea of peace in the galaxy. He died because he knew the Resistance and freedom from the First Order was far more important than one Jedi. He died knowing the Jedi would live on in Rey. He made that sacrifice.
Some people may interpret that differently, or may choose to outright reject my interpretation and that's their choice. But I for one think it is very clearly there on the screen for all to see.