Steuerausscheidung option when reporting an income from properties abroad

I have this option:

And I am trying to understand why wouldn’t I want to go for the separation?
After all, its supposed to protect me from double-taxation.
Are there any disadvantages that are not immediately clear?

From what I understand the alternative is that they’ll do it when they process your taxes.

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Yes, I left it out and they did it for me (ZH).

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