You raise a valid point about journalism. While journalism typically aims to provide factual information, it can also encompass opinion pieces, interviews, and other forms of writing that may not be purely informative. However, journalism as a genre generally includes informative texts, especially when it conveys news, reports, or analyses of events.
To clarify, among the categories you listed, both "journalism" and "how-to" are more consistently informative. "Historical" can also be informative depending on the context (like historical accounts or analyses). That being said, it's true that not all journalism pieces may serve an informative purpose, especially if they focus on entertainment or subjective opinions.
So the revised answer would be:
- Journalism (generally informative, but not always)
- Historical (often informative)
- How-to (informative by nature)
Thank you for your insight!