Why would Hagoromo create the tablet as he did?

[VongolaX]

I'm pretty sure that the senju had there own through scrolls.

Why do you think hashirama knows about the sages techniques, and how they are forbidden

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[Lightbringer]

someone made a pretty interesting theory about how the Uchiha Ancestor was the one who manipulated the tablet in order for his descendants(Uchiha) to achieve his notion of peace through power.....which explains why only those with Doujutsu could read it.

 

[Naijakid]

Kishi loved the Uchiha's

 

[Gyakusetsu]

It was an encoded message to serve as a warning that unfortunately was intercepted and changed by the true antagonist. Jiraiya's message was also misinterpreted due to interference by the same antagonist causing the handwriting quirk and subsequent misinterpretation.

 

[Bronze]

He wrote it but the elder had most likely changed a lot of it and passed it down to his descendants.