I've been mulling over this myself. I have written so much lore, and it would help me more solidly define characters in my mind, but at the same time, I don't want to spoil my plans for the story. And while I could try just filling things in as they appear in the story, that seems like just extra work, as I'll need my normal set of notes, and then I'll have to filter it for the glossary to leave out currently unknown things.
I'm really super torn on it. I really want to do it, ever since I realized what it was, and looked at some other people who filled theirs in. But I also don't want to spoil anything. Oh and I know for sure I will get lost and probably write tons of crap in it. I'm already up to around a dozen pages of notes filled with lore stuffs. There is also the issue that I would want to do it properly and I'd have to try to find or make images for everything(assuming they work? I've not tested anything so idk)
What is your opinion? I really don't want to spoil massive plot points but I feel like I can't realistically keep it up to date until it's all available in the story. Previously I thought I'd try it once I finished the story.