Why are all these Databook Info so non-canon?

[super yang]

Databook is official = canon. You just have to live with it.

no, databook is official naruto merchandise/media/literature. just as the movies are ''officially'' a part of the franchise too.
...as are any other extra-canonical, naruto-licensed entities

the only ''canon'' is the source material, the manga/

you just have to know what ur talking about.

 

[Megatolium]

It's reasonable.

You can't be a powerful ninja and only use like 2 elements.

Since EVERY Jonin is required to use 2 elements.

 

[super yang]

It's reasonable.

You can't be a powerful ninja and only use like 2 elements.

Since EVERY Jonin is required to use 2 elements.

no, that's a myth. there is no ''requirement''. that was purely a generalization statement of the average joe.

there is also no concrete requirements for any ninja position/rank - chuunin~kage

 

[KCMNaruto]

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Spoiler

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^^ Kakashi and Yamato stopped Naruto joy about "being great" stating that they just found out his element. He need to undergo training to gain ability to make full use of your chakra.