Locking lug surface area as stated above is not hugely relavent to the overall strength of an action (w/in reason). Differences in locking lug shear area, however, do have a marked influence as regard to catastrophic failures. Guess what that long RH lug brings to the table. The LH lug isn't particularly undersized either.

If you work at it, its possible to "grenade" any firearm action. Seems that I've heard of plenty more Mauser derivatives letting go over the years than Lee types.