you answered your own question
the need for more flexibility after facing the kelts forced the hellenes to counter the kelts with their own heavy armed javelin throwing unit wich was also fast and flexible
in many ways i use the peltastai in the same way as i use my thureporoi in the end it´s mainly a matter of if you prefer spear or sword (altough in a few ambush scenarios peltastai skirmish hability can be more usefull and less usefull in a field batle against light or medium cavalry)
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