The Stack Exchange model is based on facts. Questions and answers that are based on facts. How does the Workplace Exchange fit in?
Yes and no.
The majority of Stack Exchanges sites are geared toward objective answers to questions. There are, however, a subset of "Humanist" sites that are more suited to softer answers (albeit backed up with some kind of reasoning and citations).
The Workplace is a "humanist" site. Answers are usually based on personal experience of what works best in a given situation, knowledge, or more general advice.
Do you have a specific concern that led you to ask this Meta question? It might be an idea to address that rather than a broad, subjective question such as this.
There is no hard line between fact and opinion, may answers lie in the grey area between. This is true whether the question is how to implement something using a particular code library, what is known about someone’s motivation in a science fiction book or how to deal with a sensitive situation at work.
On many stack exchange sites, including this one, many of the questions require probabilistic answers. We give the answer which is the most likely addresses the question asked. When the question is very specific then the probability the answer is correct is very high and answer appears as fact. When the question is more general or when the circumstances matter, then the probability any given answer is correct is lower and the answer appears to be more opinionated. Good answers not only tell you what the answer probably is, but also also provide context so that you can decide if the answer is applicable in the case you may want to use it.
What about the workplace isn't factual?
We can certainly answer questions about what the advantages and disadvantages are and state concrete reasons why, for example, HR IS NOT YOUR FRIEND and other facts about the workplace.
We can also comment on conditions to expect, what is and what is not professional behavior, what an interviewer is looking for, interviewing techniques that are tried and true, sample interview questions, how to order and structure a resume....
Just what isn't factual?