Often in school we were taught that Wikipedia is never acceptable even for a very quick search to answer a question that might have come up in conversation. Teachers would say "well, but are you on wiki? okay that's what I thought" and then would remind the class that wikipedia is terrible. This quote, however, is an excellent point. Wiki can be used for other things than research papers. Credible sources are important for research yes, but more subjective sources can be used to make a point, start a conversation, or support claims in unique ways. Projects are often held back in small or big ways because "credible" sources can be such a narrow category. A teacher asks a student to do a project on something they love, but if that topic has little research on it then they aren't allowed to do it. It can be very limiting.