Yeah not a fan of YAML either. I simply don't see the benefit of getting rid of delimiters and replacing them with indentation. Yes, it does save several bytes, which might be important if you measure space in kilobytes I guess. It does provide cleaner files which may or may not be more readable.
It does not provide any advantages in parsing complexity. It does not provide any protection against typos.
I guess the same can be said of python, which forces indentation and therefore readable code formatting. Which is a problem that does not exist since the invention of code formatters and linters.
I like python for what it does but delimiters are actually useful in terms of readability. They provide an extra hint that the text you're about to look at conforms to a specific structure.