I feel like I do a better job of portraying the NPC with the story about the lost jungle city when it comes up in some context (shoreline encounter? There's literally a couple taking vacation who'll give you drinks and share stories. Tavern encounter? It's overheard from a drunk. Wilderness encounter? Find NPC half-dead and here's why.),
I don't have to try and drop huge blinking arrow-signs saying "plot-advancing info here!" anywhere, and the players tend to remember things that happened organically better than "anyone have notes from when nitsua dumped all that info?"