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Why do we set the parameter in HashMap to object when sending data to firestore?

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[cross-posted stack overflow: https://stackoverflow.com/questions/67406280/why-do-we-set-the-parameter-in-hashmap-to-object-when-sending-data-to-firestore]

I am watching a video to create a simple app(just to practice concepts) where the user enters the title and their thoughts. This data will get sent to Firestore.

However, I was confused on the part where I send data through a HashMap:

The title and thought are basically just the string values of the user's input for title and thought.

After that, all I'm doing is just passing it into the journalRef: journalRef.set(data) where journalRef is just the DocumentReference of my database:

My question is: Why do we pass data as: Map<String, Object> instead of Map<String, String>. Isn't the title and thoughts just the user's input as a String value?

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Answered in SO.
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