I don't see any durability here.
'nuff said.
Well, if we're using D&D as the standard, then all other RNG systems should also be in place..such as spell failure chance and ability to cause and resist effects and spells based on main stats....and everything else such a system is inclusive of.
Not that I don't see anything wrong with a digitized format of the basic D20 system. It works, is proven to work, and I think most would be happy with it.