FFXI required skill. A tank who knew how to spam skills at the perfect time could tank two mobs at once, and save the party. A tank who couldn't got the party wiped.

A healer who knew how to let player's hp get JUST low enough to keep them alive, but knew who to heal, and how to save MP was much better than a healer who just max cured anyone who got low on HP, and let out huge AOE cures becasue he or she didn't understand hate.

A bard who had an exact idea of how far his or her AOE is on songs, so they could hit the pld with a ballad, while the other DPS didn't get it.. that's skill.

A warrior who knew how to keep his hate just low enough to let the PLD keep hate, but high enough where he or she could voke of the PLD if things got messy. That is skill.

A sam who had that stun ready right when the mob was about to weaponskill, and canceled the gobs bomb throw. that was skill.

Two level 21 ninjas duo tanking in quafin without utsusemi ni, succesfully bouncing hate back and fourth.. that was skill.

a thf or rng who could pull mobs JUST in time, and get them back to camp right as the other one died. that's skill

a brd who could keep an entire party buffed, adn still have a mob waiting asleep for his or her party.

I could go on for ever.

my point: you don't need twitch based gaming to make a good combat system