You may not need armies or other units, but if you're playing as a Republic, then armies can help a lot.
I'm fully aware of this, they help rather a lot with any government type. I have 9 in my current campaign and I've also lost 4, I also have two spare that I'm waiting to fill with modern armour and another being made.
If you mainly fight with armies either 1. you win almost every battle you fight, so long as you don't lose too many cities to the AI, you basically have no war weariness
My latest battle in said campaign went as follows: In order to speed up my journey from Flight to Modern Armour I switched from Monarchy to republic for two or three techs. Once I got to Modern Armour (8 turns until discovery) I hatched a plan to take out one of my neighbours while I waited for Modern Armour to get learned then I was going to switch back to Monarchy and PRODUCE.
I proceeded to annihilate said neighbour (approx 25 well spaced towns/cities) with a target for victory in 4 or 5 turns. [Please note, all my towns/cities/metropolises have 7 luxuries and a marketplace and a temple as standard]. [Please also note I did not wish to use the Luxury Slider as this would destroy the point of switching to Republic to gain that extra turn or two in tech completion].
Anyway, everything went as planned and in 5 turns the Koreans were no longer listed at the Foreign Affairs screen. But... you know what, just in those few turns ALL of my metropolises were at breaking point (and none of them over 25 citizens big). Literally starving if I added any more entertainers to them. I must have lost no more than 10 units the entire campaign (notably, one tank failed to kill a spearman and one elite cavalry army died when it attacked a 3hp Infantry which didn't drop a single hit point) and the AI civ captured two of my towns (one by an auto-reclaim) which I retook the next turn. And that was too much for Republic...
So, when you say 'you basically have no war weariness, I'm sorry, but LOL - maybe you're talking about a different game?
or 2. you can rather quickly learn when to fight and not fight with armies. So, the war weariness problem of Republic evaporates rather quickly.
See above.
You can also 3. pillage a lot with armies to make the AI's attacks harder.
I find it much more effective to just walk into their cities with them. But yes, my Infantry Army did sit on their rubber supply if that's what you mean
This, of course, assumes that you didn't have significant war weariness before Military Tradition as you would in an Always War game.
I had engaged in no battles under republic prior to this battle and all previous battles were fought under Monarchy which has no war weariness. Also, I always thought war weariness reset to zero after you declared peace?
and to a lesser extent artillery, can very quickly make any concerns about war weariness evaporate rather quickly.
I can't say I've ever bothered with artillery. Is this another micro-micro-management of Republic by any chance? Bomb them, shell them and bombard them until you finally move your one tank in to finish them off? rather than just building 5 tanks to do the same job? in order that you don't lose units in-case a citizen gets sad? My, what a palaver.
[On the plus side, I decided to take a break and am about to win a Huge Regent 80% Archipelago using Republic. I have one town, two cites and a metropolis and am just about to hit the 20,000 culture score for one city. Not a single fight the whole game with just 60 turns to go until victory. Wonder if it'll invade me at the last minute?]