Thanks for the shout-out!
FYI, Lucy is down again ATM. This happens every time there is an game update, whether it be a new xpac or just a patch. (I don't know why that is, but then, I'm not a programmer.) This also happens on other sites, like Magelo. Their sync app isn't working right now either. When Lucy comes back up, you should see xpac item information materialize. Unless Zam prioritizes Lucy, though, it may take a while for it to be functional again.
As far as walkthroughs, it's up to us. What we write will be what goes up. I contribute here, I run Lucy, I run Magelo Sync to beef up their data for item loot percentages, and I sometimes add info to Fanra's wiki as well. Zam is a great source, but it's not the only source. I wouldn't limit your research to Zam, but at the same time, I wouldn't drop Zam from your bookmarks. I value Zam enough to pay for a subscription. In the realm of shared information, I'd rather be a seeder than a leecher.
I second the kudos for Sippin and Merf. Off the top of my head, other users that have been frequent contributors via Lucy in the last few years are Rondor Norador, Rangermadness, Byren, Tnexus, and fcoty. No doubt I'm forgetting others, no disrespect intended.