Evie
Pronounced like Eevee
I'm pretty sure I've seen an alternate definition of 4X that had one of its X (can't remember what the actual word was) representing RESEARCH. Which is something the vast majority of RTS (including the Crafts) simply don't have enough of to stake a serious claim.
However, even with the traditional 4X, the difference between the two is a matter of how much depth is given to each segment of the 4X.
In the -Crafts, the first three X are subordinate to the fourth. That is to say, yeah, you explore, expand and exploit, but the one and only point of doing this is to build an army with which to exterminate.
In Civ (or GalCiv, or AC, or several others), instead of having only one X directly contributing to victory, most of them directly do, and, instead of having three of the Xs as subordinate to another one, the Xs are tighly interlinked - working on one almost always help the others.
-Xplore : exploration of your surrounding reveals to you the best location to install new cities (Expand), new resources to acquire (Exploit) and new rival civilizations to interact with (Exterminate). In addition, exploration can be considered to include the tech tree, and exploration of the tech tree is almost always part of a victory condition (Space Race, etc)
-Xpand : Expansion gives you more city and trade, and thus, more access to the tech tree (Exploration), gives you control of more resources (Exploit), and more bases from which to build an army (Exterminate), in addition to directly increasing your points count (Time Victory).
-Xploit : Exploitation of resources again help you progress down the tech tree (exploration), build more settlers, or trade for new resources (expansion), and build better troops (extermination), and contribute to all victory conditions.
-Xterminate : Extermination (or, more properly, warfare) generally grant you access to enemy technology (exploration) either from conquest or the ensuing peace, cities (expansion) and resources (exploitation). Conquest is, generally, of course, its own victory condition again.
Essentialy that's what 4X is about : not simply having the X, but BALANCING the X, so they are each close to being equally important ; something the -crafts don't have (Exterminate dwarfs the other three in importance).
AOE II comes a lot closer, with the concept of the Wonder and Relic victories.
However, even with the traditional 4X, the difference between the two is a matter of how much depth is given to each segment of the 4X.
In the -Crafts, the first three X are subordinate to the fourth. That is to say, yeah, you explore, expand and exploit, but the one and only point of doing this is to build an army with which to exterminate.
In Civ (or GalCiv, or AC, or several others), instead of having only one X directly contributing to victory, most of them directly do, and, instead of having three of the Xs as subordinate to another one, the Xs are tighly interlinked - working on one almost always help the others.
-Xplore : exploration of your surrounding reveals to you the best location to install new cities (Expand), new resources to acquire (Exploit) and new rival civilizations to interact with (Exterminate). In addition, exploration can be considered to include the tech tree, and exploration of the tech tree is almost always part of a victory condition (Space Race, etc)
-Xpand : Expansion gives you more city and trade, and thus, more access to the tech tree (Exploration), gives you control of more resources (Exploit), and more bases from which to build an army (Exterminate), in addition to directly increasing your points count (Time Victory).
-Xploit : Exploitation of resources again help you progress down the tech tree (exploration), build more settlers, or trade for new resources (expansion), and build better troops (extermination), and contribute to all victory conditions.
-Xterminate : Extermination (or, more properly, warfare) generally grant you access to enemy technology (exploration) either from conquest or the ensuing peace, cities (expansion) and resources (exploitation). Conquest is, generally, of course, its own victory condition again.
Essentialy that's what 4X is about : not simply having the X, but BALANCING the X, so they are each close to being equally important ; something the -crafts don't have (Exterminate dwarfs the other three in importance).
AOE II comes a lot closer, with the concept of the Wonder and Relic victories.