Wait! There are sources of information other than things put onto a Wikipedia page? Next you'll tell me they're still printing books somewhere.
Oh they still do. You can even find these books in the fabled halls of Barnes and Noble
Next thing you'll tell me that reading wikipedia is not enough to qualify someone to argue in a chat forum with a person who's got actual knowledge of a subject!
Ah degrees and professional training matter not to the fedora mafia.
The serious barriers for me are when all of the meaningful sources are in a language other than English. Being an ignorant anglophone monoglot, that makes it hard to write a timeline set in, say, Tay Son-era Vietnam.
Even though I'm trilingual, and having working knowledge of two other languages, I'm only truly literate in English. So I know your pain.