More minimalist weapons, armor and some numbers

Another random idea for B/X D&D weapons.

I've tried this before, but I like this version better.

Since maces/axes deal 1d6 damage and swords deal 1d8, we could use:

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Maces get +2 against armor.

Axes get +1 against armor, and +1 damage against unarmored.

Swords don't need it but can get +1 to-hit against unarmored. Still best weapon unless foe is heavily armored.

[Hard/brittle foes made of rock or bone count as armored, soft foes such as oozes and maybe snakes, tentacles etc. count as unarmored].

Of course, maces and axes are always more useful to break down a door.

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That is it, that is all we need. Or not - maybe the sword is just better because it is heavier and more expensive.

But while we're here let's crunch some numbers.

In B/X, the best nonmagical armor you could get would be plate + shield, which a first level character (any class) hits on a 17 or more - i.e., 20% of the time.

This is a DPR of 0.9 (20%*1d8) for swords. Maces hit more often, for a DPR of 1.05 (30%*1d6). A nice small improvement.

[Notice that our change adds 50% to the mace's DPR under these circumstances].

If you put the target in chain, no shield, the sword is identical to mace on average (1.575); against lighter armor, sword is better again.

The axe is never quite optimal but it works well enough against armored and unarmored foes, and it is just slightly worse than the sword against unarmored opponents.

The thing is, once you get ability score bonuses and magic weapons, the whole distinction becomes almost meaningless. 

For example, under the usual rules, if your fighter deals 1d6+5 damage with a mace, getting a 1d8+5 sword is only an 11% improvement in DPR, instead of almost 30%. 

And if you're hitting on a roll of 6 or more (75% of the time), for example, getting a +1 bonus is only a 7% increase in DPR. And you're unlikely to face a foe with negative armor unless it is a dragon or something.

So, while the distinctions will lose importance to powerful heroes, they are relevant enough for low-level PCs and armies in general.

Note that, in AD&D, these small rules could partially replace the complicated weapon versus armor table; they'd be a bit more significant against plate+shield, which requires 18 or more to hit for a 1st level PC. 

Also since you need a 20 to hit AC 0 in AD&D, and monster AC is usually the same as B/X,  the differences are more notable and relevant for a bit longer.