I agree with AJW, even if what you say is partly true Prevenge, but all the things in besiege aren't high tech at all, even if they are actually not medieval, furthermore, the high tech stuff (pistons, grabbers) are all neutral parts, not weapons, these are indeed medieval (even the flamethrower is, as it's just a barrel of Oil stuck to a pipe), so adding lasers would be logical only in a tool way, therefore, they shouldn't be able to burn anything, because that would be downright a high tech weapon.
Besides, if they start adding stuff like lasers, why not then add computers? Add plasma launchers? Magnetic fields? Railguns? Light sabers?
That will turn besiege into minecrap, a game overloaded with pointless stuff that has nothing to do here.