I'm guessing your reading the "Chicken Little Brief". All that says is that the sideflare is a safe maneuver. Which it is. And it's a great maneuver for vertrep to keep a clear view of the area you're vertrepping to.
Like I said earlier, I don't think there was ever a conclusive reason for the FS 308 cracks. However, a lot of the evidence pointed to the repetitive loading/unloading of the airframe. The kind of cycles you see in the transfer of the weight of the airframe from the head to the gear or vice versa on landing or the loading/unloading from numerous vertrep loads.
The physical airframe was never tested for VERTREP loads as the HC world normally performed them (yes, A's/L's etc have an extensive sling-load history with the Army, but that is a very different evolution).
I have waded a lot deeper into the engineering waters of this issue and the short version of my opinion is that while I agree that sideflares/buttonhooks/etc are not the root cause, it is hard to argue that they help any. Airframe fatigue for VERTREP birds will be a painful and expensive issue with these aircraft, while limitations on how much VERTREP the Sierra does (and how that is performed) is much cheaper and I really wouldn't be surprised to see limits make it into NATOPS/SOP.*
Not only are the Pumas fast enough and tremendously cheaper, they are paid for out of a different pot of money, don't count against end-strength, and what they do cost is much easier to control and ramp up or down as required.
File this under the same category as UAV's - it is going to continue so you may as well accept it.
* Note, I am NOT saying that sideflares, etc, are unsafe (though I don't do true, -46-style buttonhooks because I don't care for the vibrations). I still routinely do those and similar, oh-my-god-he-is-moving-in-more-than-one-axis-at-a-time maneuvers in both the S and R, I just think it would be really easy for the Big Navy to tell us to stop, especially considering HC being absorbed by HS will seriously dilute leadership's inclination to fight it if that ever came to pass, not to mention the large HSL contingent at PMA 299.