[dwaltrip]

This is a very insightful point. These models and concepts are all human created abstractions.

They contain elements of arbitrariness, describe different levels of detail, focus in on certain aspects or dynamic, leave out other information, and so on.

The skilled software developer must determine how useful and well-suited any particular abstraction is for the actual problem at hand, and judiciously move forward that.

As understanding of the problem domain grows, the abstractions should be updated and discarded to reflect this.

Pragmatism is key -- what does the system actually need to do? Supposed platonic ideals of some conceptual object are often a wild goose chase. Reality is complex. We must embrace it.