>why even have skirmishers if they were so useless?
Because forming a phalanx is a long, slow process even without the men being pelted with stones, arrows, and javelins. If you're not able to form because people keep getting wounded, concussed, killed, or run off the chase the psioli, you may get hit by a fully formed force when you're milling around.
They're also considerably more dangerous if they're left totally unopposed and are able to walk uncotested into your flanks and rear when the phalanxes meet.
More importantly, because that isn't how it works you fucking faggot. People weren't showing up to war with a bag of rocks or a sling+eating knife because they thought it was a good tactical choice, they did this because that was what they had. Psioli were what they were, and greeks got what use out of them they could. Later shifts towards using more skirmishers involves a far better equipped class of men, and even then, they were never a decisive fighting arm.
>Which isn't true considering Spartans got fucking rekt exactly by skirmishers.
Precisely twice, One when cut off with limited food and water on an island, by a force that outnumbered them by an order of magnitude, and which had plenty of hoplites, and once when a small force led by an utterly incompetent commander got jumped. That's it.
It wasn't a birth rate issue. Spartans could fail out of the spartiate class, or LITERALLY sell out. Getting back in was usually not possible. Even with a higher than average birth rate, the spartans numbers would dwindle.
>Neodamodes were a class of citizen formed out of helots who served as hoplites for a while. It was created after the success of Brasidas' expedition to Thrace during the Peloponessian War, that used helots as hoplites, and later granted them freedom.
Entirely true. Still doesn't support the idea of "helot meat shields."
Because they weren't all talk.