Maybe AI logic rework will change this, but right now most wars are not won by grinding out a bunch of battles. Having more bodies doing sieges safely is more attractive.
Whether any military group is worth before luxury pick timeframe is debatable, but I would expect quantity to be one of the better performing military groups in SP if you pick one.
That doesn't work for me. I lose the siege races too. Space marines lets me just beat the enemy into submission. If a I need a bigger army, that's what France, Austria, Ottomans, or whatever other regional big bad I've allied to be my shield/battering ram is for. If my strategy is hoping the game gives me better dice than the AI, then I've already lost. The dice hate me.
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