I just deleted all my old worlds. Needed the gigabytes of drive space back. It was sad, but... life goes on. However, there's one world I could not and did not delete... my Ultimate world from 1.4.7 days, which is still my best world even tho I haven't played it for at least a year. I've played a lot of modpacks since Ultimate, but that one still seems to have been the best in my opinion... of course, there's a bias involved - Ultimate modpack was the first time I had ever played most of the common mods. When you've played a mod in 6 or 8 different modpacks, it does unfortunately begin to get a bit routine and loses some of its charm (thru no fault of its own). But yeah, MJ will just be a memory I guess even tho it will live on in my Ultimate world until I finally delete that one too someday.