Who said they are space sims? He said Sword of the Stars and it is a RTS game, and he said it is great. And I suggest him Homeworld and Sins, because they are better RTS' than Sword of Stars? Is this wrong? Don't try to make me stupid, I know what is space sims and what is RTS games.
Except, of course, Sword of the Stars is not an RTS either. It is a turn-based 4X-strategy game with real-time tactical space combat. Granted, one could classify Sins as a 4X-strategy game as well, but as it's real-time it can not hope to compete with Sword of the Stars when it comes to depth and complexity.