I agree with you stylistically and don't personally use that brace placement. However, given the number of people writing C++ code for the F-35, it makes sense to settle on a standard that is never ambiguous. When nesting multiple control statements, it can sometimes require good judgment to know where to place braces for maximum readability. Giving each one its own line avoids requiring your developers to exercise good judgment in all the myriad cases.
Yeah, but that's a stylistic choice. IMO this is one of those cases where one choice isn't better than another, and it's just better to have made a decision.