The more I read up on the roles of Peltasts and Thureophoroi it's clear the current AI recruitment option theses units and others that did similar roles in a little inadequate. They shouldn't be classed recruite as infantry_missile or infantry_melee and as not all of the are armed with spear infantry_spear is also unsuitable. The lighter Peltasts which evolved as the Thureophoroi replace their role would of been more like Psiloi, and the heavier, mail wearing Thureophoroi would of been heavy enough to be infantry_spear.
This is about AI revruitment. The AI shouldn't be recruiting peltist at the expense of Psiloi, especially Creten Archers, and equally it's shouldn't be recruiting Thureophoroi when it should be recruiting Hoplits.
Adding a new unit key for infantry_light should help with the ai's recruitment of these types of units.
Any thoughts on how historically accurate this would be?