Just to add another data point, pattern aircraft are also very lightly built, with 2M planes having 74" span, ~950sqin wing area, huge fuselages and massive power. They are expected to last several thousand flights under these conditions. Pattern pilots are generally very careful with maintenance and not beating the airframe as well, which is not usually typical in 3D profiles. They religously use soft mounts and many have measured much lower servo current draw using the soft mounts to reduce vibration.

Just a thought relating to the use of soft mounts and on the Hyde mount in particular, since it is the gold standard for pattern use. Properly installed, it makes a huge difference in airframe life and does not cause more problems than it solves. Installing one in a profile would be challenging, though, because of the nose ring requirement.

Mark