How is Sins not a 4X game?eXplore? CheckeXpand? CheckeXploit resources? CheckeXterminate your opponents? Check
I did that with C&C back in 1995...
I personaly hate the 4x tag, it's meaningless to me.
RTT - Real Time Tactics: C&C, TA - the only logistics and planning (thats stratergy) in C&C is makeing sure you have enough resoruces and deciding what to build (MAMMOTH TANKS!)
RTS - Real Time Stratergy (also
RT4X or
4XRTS): Sins, Fragile Alliegance (not quite SupCom but it's has some good planning/logistics elements). This type of game simply can't be that deep in the stratergy aspect because of its real-time tactical-command-driven nature.
Grand Stratergy: Total war (entery level) to civ. This is usualy what people mean by 4X. Usualy this is simply about managing the numbers (rather than tactical control also).
As such Sins fits perfectly into the middile option and not the other two.