It's not. Your eyes can deceive you by guessing the correct indentation. Indentation should never be used for grammar separation. Explicit characters such as } ] ) are clearer and unambiguous.
Clearer for the computer, but not for the human. Many errors, some severe, have been caused by a human only looking at the indentation and not realizing the braces don't match.
IMO, that is the only acceptable situation where semicolons can be removed from the language... if you need to add indentation rules, you've failed.