Thanks for the injection of enthusiasm! I’ve commented elsewhere that I see the importance of Luke choosing to use the image of the saber he rejected at the beginning of the movie. When TFA came out I said I’d have rather the green saber been the macguffin than digging Anakin’s out from the void. I get why it’d be desirable, but why open that can of worms?
But, given that TFA gives us Anakin’s and that Luke rejects it at the start of TLJ, it’s right that he should wield its image at the climax.