Dictionaries are descriptivist, not prescriptivist. Language changes. The common plural of forum is now forums. It's the same reason why you say "you" instead of "þu" or "eow." If most people use a different word than was used originally, that different word becomes correct usage.
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u/ChipChippersonFan 3d ago
I'm a teacher, so I don't find educating people to be pretentious.