It's an indirect consequence of the lore being more coherent over-time.
All those darkin, demon, celestial or watcher theories happenned because the lore was so obscure, it was kinda fun to guess "what would Riot do" with the few hints we had.
Now that those concepts are explained, the remaining "unknown concepts" have so little information that we end up like :
- yep that thing exists
- i have no idea who that is or how it works
- i have no clue to help me figure out
- guess i'll wait until one day it becomes explained
It's not a complaint, but more like how i see the current state of the lore.