FFXI has earth and wind elementals and the spells of those elements are as plentiful as for all other elements. Aero/Stone 1-5, Aeroga and Stonega 1-4 (-ga ending denotes AoE rather than the normal singletarget), Tornado, Tornado 2, Quake, Quake 2. Furthermore, buffs also have elements. Wind has blink (absorbs a set number of hits), earth has Stoneskin (absorbs a set amount of damage), water has aquaveil (reduces spell interrupt).

Almost everything has an elemental alignment in that game, which is further affected by the current ingame weather and day. Casting thunder during a lightningstorm will occasionally increase the damage and accuracy of the spell, and so on for all other spells.

That aside, and more on topic, I guess there could have been a few more elements in the game, in particular a water based aeon, as we covered all other elements. I guess the lower number of aeons is offset by giving us a lot better control over their behavior and also their development.