Like you Rayne, I adored that aspect of AO. And, yes, it absolutely was part of the game and class design.
I agree with what you are saying - that to wring every last ounce out of the stat system required a fair bit of thought, stacking buffs that allowed you to use other buffs etc, then swapping out implants to use more, but even the most basic players could quickly learn the system and grab some major buffage to allow them to equip gear - they weren"t equipping QL200 gear at lvl 50, but it wasn"t hard to get ahead.
To me, that was the beauty of it.