You're talking 'bout the warfare theory, I'm talking 'bout the Civ3 implementation.
OK, let's discuss it a bit (it's not off-topic as it's discussion of the current pack which may be (hypothetically) extended).
According to your words, archer has A/D = 2/1, spearman = 1/2, swordsman = 3/2.
We can place javelineer between archer & swordsman with stats 3/1 (good attack + less armor), will it be correct according to the warfare theory? Looks like, almost - swordsman should have 4/2 or even 4/3 - if it'll remain as 3/2, then there'll be no benefit from having the Iron. And 1 more unit - horseman, 2/1 2moves. I don't believe javelineers stronger than horsemen - then if javs 3/1, then horsemen 4/1, then swordsmen 5/2 (terminators
). Archers become obsolete - they won't beat swordsmen.
One more idea was told by
Steph once - he left spears with 1/2 but added +1HP bonus. Archers fail again (redundant) - the question with the horsemen type remains.
So, I don't see a reason to add both archers & javelineers if they'll be used in the same era. OK, they may be separated by the half of the era, but I suppose javelins throwing appeared to be used even earlier than bow.
How to force AI to build less effective archers?
How to force HUMAN to do it?
One more thing - what if there could be added horse archers and horse javelineers...