Reasoning absolutely does help. If I am in Mexico and hear a new verb, and I know the rules of conjugation, I can use that word immediately in all tenses, rather than having to randomly wait to hear the word used in every tense by a native speaker.
The thing is--if you read the articles--no one is denying that conversation with native speakers is an essential component, and can be difficult to replicate in the classroom. That doesn't mean, though, that other tools are not also essential to optimal results.
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