I’ve played all of the mainline games over the years, but my only experience with FFXI was a couple of hours of the beta. Tried the marathon as a set of replays several years back and only made it to the start of IX. The load times and the glacial pace of the battles was too much by that point. I think I was planning on skipping XI.

You could also trying asking in !finalfantasy@lemmy.world and !jrpg@lemmy.zip.