Why people call content unlock quests "blue" ?

[Elissar]

Isn't always.
I'll remember her name and link here.
https://finalfantasy.fandom.com/wiki/The_Honest_Truth You can follow this chain
or look for similar cases https://www.reddit.com/r/ffxiv/comme...nything_as_of/

Just like we have blue quests that don't unlock anything, we have yellow quests that gives you an emote (https://ffxiv.consolegameswiki.com/wiki/Feature_Quests).
I found a yellow in Stormblood near to a village with a chain that told me a sad story about a couple that was separated from each other when the Empire arrived. He died in the war, she died because of solitude waiting for him. Both was buried next to each other. This quest was special because the way you get it done had an minigame included, you had to look at pictures and locate the place.

We need a "journey guide" as a feature.