[8lall0]

1) No, no, no, please avoid stuff that needs to be indented in 2021. YAML is more than enough to prove that is a silly thing to do.

2) If your configuration file is too big, maybe you're doing it wrong.

3) TOML is by far the less ugly format for configurations that i've ever used. Far from perfect, but it's predictable and doesn't require indentation.