This is something I have pondered before.
The leading edge of the Robin is a formed ‘D’ attached to a wooden box spar and not overly engineered.
If you got stuck in mud at the field and someone pushed un-sympathetically on it, it can be damaged.
We had poorly fitted inspection discs under our Robin wings. We would always check them before each flight as we lost a few over the years.
The concern rightly or wrongly was either pressurising the wing or causing undue suction into it depending on airflow.
Sad case for these guys.
I would consider lowering 1st stage of flap and slowing up in the case of seeing wing deformation, but in some way that could make things worse as the aerodynamics change.
It won’t put me off having another one.
In the case of the Robin a bird believed to be a cormorant weighing about 2.4 kg hit just behind the leading edge, which is plywood and ripped the fabric on the whole underside as far back as the flaps. It disturbed the airflow and the the lift on the wing with a tragic outcome. The most inexperienced pilot (student was flying at the time),
If one looks at the before and after photos you can clearly see what looks like a vacuum has formed by the way the ribs are more prominent through the fabric.
According to the report it isn’t the first time it happened a few years before but the pilot made a successful landing. It also goes on to mention other fatal accidents to light aircraft caused by bird strikes (not just in France) and not all in wood and fabric aircraft. The report makes particular mention of a TB20 and a Cessna 172.
So I don’t think this accident makes any particular point about wood and fabric aircraft suffering any worse than other types from largr bird strikes.
A 5 lb bird hitting any wing at 120+kts is going to damage something. Luckily for us usuallly the birds are smart enough and agile enoigh to get out of the way… A very sad event.
Of relevance, another DR.400 (F-GDKT) lost the entire top surface of a wing during a post maintenance flight, but returned to the aerodrome and landed safely. The fabric had been excessively sanded prior to repainting (invisible to the naked eye), weakening it enough to make it tear in flight then rip off completely.
It was a 180hp rather than 120hp, so very likely to be flying faster at the time, but with a bigger engine and less payload a bigger margin to the stall. It was also a test flight with a prepared and experienced pilot who didn’t have passengers/students or baggage. The leading edge and bottom of the wing were unaffected. It’s hard to tell from the photo, but it looks like the fairing saved the aileron control from damage.
https://bea.aero/docspa/2009/f-kt090716/pdf/f-kt090716.pdf
2 or 4 times more chances if it’s Tiger Moth or Bi-Plane
http://www.aaiu.ie/sites/default/files/report-attachments/REPORT_2012_016.pdf
Obviously God created aluminium and carbon for a reason 
