RATIONALE: why the two styles? Why

  if (simple_condition) {
    code;
  }

but:

  if ((complicated ||
       multi_line)
      && condition)
  {
    code;
  }

?

Simple: it's because in both cases, the "code" follows a previous line from whose first non-whitespace character it indents by the indentation level:

  if (...
  [INDENT]code

  {
  [INDENT]code

This is just wacky:

  while (blah
         blah
         blah) {
    code
  }

"code" isn't "indenting off of" anything. It is not related to the indentation of "blah" in any way, but appears to be "deindenting" from it!

So, rather than dogmatically doing one thing or another, it's better to consider all the alternatives, their relative advantages and disadvantages, and integrate them into an elegant whole.