I have only seen 2 wing failure incidents in a modern (since ~1990) ARF & they were both VMAR models -- the wings failed at the mid-point not at the root. While I certainly don't discourage anyone from glassing wings, based upon my own experience I'm not convinced of its necessity, as long as the model is constructed or assembled correctly in the first place.

I have a couple of 10-yr old Superstars that have been brutally mistreated all of their lives. Both were simply put together as the manufacturer recommend, but they were both powered by TT .46 Pros & both had their necks wrung as hard as possible -- snap rolls following hard pull-outs from terminal velocity dives. They have subsequently been modified extensively, including conversion to no-dihedral wings using hardwood joiners, without glassing. The engines have been hopped up & they both exceed 75 mph in level flight (still with full-span wings). The high-G abuse was greatly intensified following the mods & not a hint of wing failure.

I think that some models probably do need extra strengthening, but certainly not all. I also think that good work practice in construction & assembly is essential -- but that should always be the case.

I don't glass my wings & I haven't had a wing failure since the early 1960's (it took me a quite a few years to finally admit that lightness is a virtue, but strength is a necessity).