A particular weapon, for example the Hoplite Spear can and will alter the tactics available to any given commander and can influence the outcome of a battle and thus the overall outcome of a war quite significantly.
Thinkg like the changes in Cavalry and Armour, going from Bronze to Steel, the discovery of Carbon Steel, Star Fortification, the advent of the Machine Gun, Battleships, RADAR, Wireless Communication, Aircraft Carriers and many other materiel factors can influence warfare.
This is what the point is, what weapons influenced the most, whether it be directly or indirectly.
First of all, you just quotes a list of things that either aren't weapons, or are generic ones. Yes, the invention of the spear changed warfare (but probably not as much as the arrow) but there's no one spear which is influential. There were many reason for the effectiveness of (say) the Hoplites, but their weaponry is low down the list, given that it was little different to their enemy's gear.
Second, you seem to be agreeing with me: that the individual weapon is only a small factor in warfare, compared to the various other things. The secret of cavalry for instance, was not the spear, or the sabre, or the arrow. It was the stirrup. Followed by the successful training, the co-ordination, the tactics etc.
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