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They are all aimed at the Goldfish Gamer with no sticking power to field an army, they are just games, no more, no less.
There's nothing wrong with those preferences, but I suspect that Warhammer, et al, have helped to create a bigger appetite for 'flavour' - which might encourage game designers to throw in testudos and phalanxes even when there are too few men to form them.
It will get worse... The lardies are jumping on the ancient skirmish bandwagon as well.