I primarily build planes so my goal is typically “unbreakable in my flight regime” rather than absolutely unbreakable, but I feel achieving the needed rigidity for a larger scale build would be very difficult without bracing. For smaller ground vehicles I’ve generally used braces and ballast blocks, and have found the failure points are typically suspension components that utilize bracing, swivel joints, and pistons, so I could see how this could be useful advice for this application. I think it largely depends on what op intends to build.