ILF recurve limbs tend to be wide and thick in comparison to many of the hunting set-ups and are new to the hybrid/longbow limb. They were created for stability and endurance and it is reflected in their design. Many of the new hunting bow limbs being made with foam cores are being done in new designs that haven't been tested over time with these core materials. These newer designs are the ones that have yet to prove their durability, especially at the higher weights they are being built in on much shorter risers and much narrower and thinner limbs. Some of the newer makers have already started making thicker cores I've seen though.