As a kid I thought a green lightsaber meant you were a Jedi Master, since Luke got one when he finished his training, and everyone who had one was a master (Yoda, Qui-Gon). It then occurred to me that Obi-Wan had a blue saber despite being a master. I assumed that was just an exception, but over the years, I noticed more masters with blue sabers and came to realize how meaningless the coloration was.

Honestly, I find it kind of dumb that they would give Jedi an alternate saber color without any real reason. It’s not like they decided Jedi could have any color saber. They specifically gave them blue and green. All colors, or just blue, and only Luke had green because he was more balanced than the Jedi, I could understand, but blue and green? Why? On top of that, the two BTS explanations I’ve heard provide pretty weak reasoning for Luke having green in RotJ; either they didn’t think audiences were smart enough to figure out that this was a new lightsaber and that they’d wonder how he got his old one back, or they thought blue didn’t contrast enough against the blue sky of Tatooine.