That being said, there's merit to the idea that lockstep dogmatism to a 175 year old definition of a political model isn't necessarily a successful model for any given present day era.
This is why I'm wary of "read theory." Sure, read theory, but don't treat it like a Bible. Expand, adapt, update, adjust.
Besides, like all science, theory should be reproducible without need for the text. Theory after all means "best guess," and it's supposed to be vulnerable to new realities and discoveries.