Re: "Internal" and "External"
If you go and talk to an experienced practitioner of Chinese IMA and ask him what the goal of his practice is, I doubt he will answer that it's to move something.
Hence I shrink at any suggestion (even if it's unintended) that moving something is somehow the goal of the practice. We all have different reasons for why we train, and the various litmus tests that are aimed at teasing out how and what we train are both imperfect and incomplete. The fact that you can both produce the same externally visible results for one particular test as a result of your training does not suggest that you are both in fact training the same thing.
Correlation does not equal causation. It's crucial to keep this in mind when you frame a discussion as such.