Bionicle had lore like no other theme LEGO has ever done, it had comics, graphic novels, tons of games, and so much more, the complexity and amazing story telling (Thanks Greg) allowed the theme to amass fans from all age ranges. Most Lego themes now have very little lore and media that will attract older people, mainly I'd just say now LEGO has drawn a very clear line of what will be for the younger and older audiences.

Ninjago has had so many soft reboots and changes I lost a lot of interest, the overall lore all the way up to WildBrain's takeover was great, after that stuff stopped making sense.

Hopefully, someday LEGO will go all out on a theme like they did with Bionicle.

I should also agree about Bionicle, but what about other themes like Nexo Knights or Galidor?

Ninjago and Nexo Knights are very similar in the level of story telling and lore. Chima on the other hand was very lighthearted and fun, with enough story sprinkled in older people could enjoy it. The similarity between Ninjago and Nexo Knights is partly because Nexo Knights was supposed to replace Ninjago and therefore LEGO used Ninjago as a marketing model for Nexo Knights.

Galidor and stuff like G2 Bionicle was ended so fast its hard to say and compare it to themes that lasted longer as we don't know where the story was really going.

There is so much to discuss on the subject of LEGO themes and their lore, I'm barely touching the surface, haven't even mentioned Elves, Hero Factory, and plenty more themes.

I completely forgot about Elves. What's Hero Factory? I've seen the mobile game, but I don't know the setting

Ninjago, no doubt, I rewatched Masters of Spinjitzu and NINJAGO (2019 - 2022) and I liked it a lot more than when I first did.

Ninjago is goated

^ I believe that, but I'd think Bionicle would fit it better