Readability? It is crucial for indicating which code belongs to specific blocks to help the compiler/interpreter and humans alike. There are primarily two methods for structuring code to achieve this: rigid indentation rules, as seen in Python, or the use of brackets. Elixir and Ruby use end blocks, which essentially serve as a substitute for curly braces.

Similarly, when considering JSON versus YAML or TOML for human readability, the same principles apply. Personally, I find indented code more readable, but this can be easily attained in most languages with universal code formatting rules and intelligent code editors that highlight different elements to improve readability.