For a simply stats based answer, they lack greaves.

For a more historical answer, the klerouchoi were pretty much reservists, and while they were kept in fighting shape through short term call-ups and exercises, they were not meant to be active duty soldiers. Ideally, klerouchoi (sometimes called katoikoi) provided a source of political stability away from the Successor states' centers of power, and would only be called up for occasional short term military duty. Many thousands of klerouchoi were called up for Raphia by the Ptolemies, and many of them served for several straight years--this was as much the cause of the rebellion that followed as the 'ethnic/national pride' engendered by the success of the machimoi phalanx at the battle.