I can't speak from experience, but I think the biggest "con" to having a blade on your FEL arms is that there might be a lot of torque if one end of the blade catches on something immobile. That could bend the FEL arms.
That said, I don't know if there is much more torque on the arms with a blade versus driving into a dirt pile and hitting something.
A solution has been posted on this forum that involves snowblades mounted on buckets/FEL arms that have trip springs, that would work well for softer materials such as snow.