Why are encyclopedias a poor source of primary information?

I need it NOW!!!

There are almost infinite levels of depth you can explore in any subject. What is a good source for one need might be a poor source for another. I don't know that the assumption in your question is valid. To get to a complete understanding, you can spend a lifetime studying the question. If you "need it now!!!" that's what encyclopedias are made for.

-If you mean the website then heres my answer.

Got to remember, encycolpedia.com is changed/corrected/edited all the time! People can add false information but as some add the correct information to the question asked or is a relavent. Maybe try another website? (Google it)