Weapon upgrades should change the color of the weapons, not the military line upgrade. Like right now it looks like this:
The first 2 weapon up grades are almost not noticeable even the iron weapons only change noticeable certain appearce like the berserker axe. (Most other units not much).
This should be changed:
1.The copper weapons should change the color to copper (which is right now changed by medium upgrades).
2. The bronce weapons should change to bronce (which is now changed by the champion upgrade)
3. The iron weapons should give iron appearance (now changed by the heavy upgrade)
These 3 points were changed in retold are very confusing and was changed in Retold.
I personally prefere the heavy units looks with iron upgrades but right now the champion units look like they have bronce weapons.