it may be 'clear' to you, but as has been pointed out, it can be ambiguous as to what the code will do. The example with a line starting with an open bracket is one such example.
Why force yourself to remember edge cases, when you can just remove that whole class of bugs by being explicit about what you mean...
I am certainly not against coding practices or readability. With (Q)BASIC, you could also add semicolons and have multiple statements per line, but who did ? It seems that it is the same with Javascript, semicolons are separators between statements, as well as newlines : why write both ? just to be sure they are well separated ?