I imagined the hoplite gameplay as being played out as such -
Exhaust throwing jarids, move in on target, still shielded - once within range throw shield on back and fight as polearm user. I find having a shield to hide behind is awesome for arrows and such, but one of my favorite builds was pure polearm which I never used a shield unless mounted. This would allow me to safely throw from behind a shield, use the shield in group combat to poke enemies with as a team, then of course the abaility to just use a polearm like a 2 hander.
It is certainly not as effective as a 1 hander and shield when using a shield, but it's a different style all together I guess. But I guess the polearms I am used to like say the Glaive are not usable with a shield anyhow.