Escalation isn't apocalypse because at most you get ONE lord of war, not as many as you like, and you have to follow the force org. There are also additional penalties for having one (opponent seizes easier, extra VP opportunity, and alternate warlord trait chart), and they don't score. You're also very limited in selection compared to what is available through FW and the regular Apoc book.
The rules for these units are the same as Apoc, but the framework around them is different.
How is D killing a unit any different than a broadside and missile drone unit killing a unit? Both are enough firepower to wipe out almost anything without a 2+ rerollable save, and you can always throw a 2nd missileside unit in for less combined points than super heavies with D. D is just a faster way to resolve it.