Wikipedia is actually the secondary source when someone reads a page on it, and it requires primary sources (like factbooks) to cite to exist.
Primary sources aren't completely disallowed, but they are definitely discouraged.
"The concept of primary, secondary, and tertiary sources originated with the academic discipline of historiography. The point was to give historians a handy way to indicate how close the source of a piece of information was to the actual events.[a]
Importantly, the concept developed to deal with "events", rather than ideas or abstract concepts. A primary source was a source that was created at about the same time as the event, regardless of the source's contents. So while a dictionary is an example of a tertiary source, an ancient dictionary is actually a primary source—for the meanings of words in the ancient world."
"All sources are primary for something
Every source is the primary source for something, whether it be the name of the author, its title, its date of publication, and so forth. For example, no matter what kind of book it is, the copyright page inside the front of a book is a primary source for the date of the book's publication. Even if the book would normally be considered a secondary source, if the statement that you are using this source to support is the date of its own publication, then you are using that book as a primary source."
https://en.wikipedia.org/wiki/Wikipedia:Identifying_and_usin...
Perhaps the jist is more about 'Primary' means different things to different groups in different context. And just saying the plain sentence "Wikipedia doesn't use Primary" is a really shallow incorrect take.
https://en.wikipedia.org/wiki/Primary_source
"For example, a memoir is a primary source when it is used to study its author's life or personal relationships, but the same text becomes a secondary source if it is used to investigate broader cultural or social conditions. Thus, the categories “primary” and “secondary” are relative and depend on the historical context and the purpose of the study. "Primary" and "secondary" should be understood as relative terms, with sources categorized according to specific historical contexts and what is being studied."
I do, when I’m reading something and accuracy matters. Anybody who cares about accuracy will investigate the sources. I know people will complain that “nobody” does this, but it is essential, without checking sources you are just casually reading. That goes for books and all media consumption. If a book or any media (ahem Tucker) doesn’t give you enough information to be able to look something up, that is rather a red flag of obfuscation.
Take population estimates for instance. Much of the world either doesn’t have the state capacity or can’t be trusted to maintain accurate, publicly known population figures. There are some countries where they haven’t had a census in decades and their official population figures are entrusted to numbers provided by regional governments which receive national funding on a per capita basis. Every region has an incentive to inflate their population numbers and, in a system where they’re all competing for funding from the central government, this eventually becomes common practice. Even national governments have little incentive to share honest figures with the rest of the world, and national governments that aren’t even accountable to their own people like China and Russia are also well practiced in keeping secrets. And population is probably one of the easiest things to measure.
The problem is that some people just accept the first number they find and are militant about not thinking beyond that point. If you tell them the radiation meter tops out at 3.6 roentgen, they say “3.6 roentgen, not great, not terrible”.
is is the Gulf of America or not?
Everyone has to end up filtering at some point or it’s all just noise.
We have plenty of bits, at least.
Drowning beneath your inability to Google.
That’s why I used to like Quora - you would often see an answer provided by the primary (and only definitive) source for questions.