Those are some incredibly broad and strong statements. What do you mean by professionals? What field? I know plenty academics who often start looking at Wikiped

Those are some incredibly broad and strong statements. What do you mean by professionals? What field? I know plenty academics who often start looking at Wikipedia as a first entry to a topic, and it is not uncommon to cite Wikipedia for example for a common definition. Yes for many things you would not cite Wikipedia because you would rather cite primary sources. That's also why I don't understand your statement about newspapers, there are plenty of fields (e.g. Political science, history) where newspapers magazines are important primary sources. The argument that things change is also week, books change as well so we cite the Edition, similarly you should cite Wikipedia (as well as other online sources) with a retrieval date.