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I don't understand this concern. How exactly are you copy/pasting code such that significant indentation causes "real problems"?

I remember the creators of Go explained [1] that they chose explicit block delimiters because of problems they saw when embedding snippets of Python in other languages. But this seems like a very niche kind of problem.

[1]: https://go.dev/talks/2012/splash.article#:~:text=we%20have%2...

Scope being determined by indention makes it easier to paste things in the wrong scope and not notice.

Fun fact, in Python, the indentation is checked per block. So, in the outer block, indentation can be 2 spaces, while in the inner block, the indentation is 3 spaces. The only prerequisite is that the indentation in the block is the same.

This, to circumvent copy/paste issues.

If your editor messes up indentation when copy-pasting, you need a better editor.

You paste code in more places than just your editor.