Doctrine is a body of thought, so it certainly can be what is taught. Doctrine consists of fundamentals, TTP, terms, and symbols. TTP provide explicit guidance as to the "how," so it depends on the manual's scope and purpose on how explicit you get. You absolutely right in that you don't throw Infantry Platoon Tactics at 2LT and assume he is good to go. While there is a reason D comes first in DOTMLPF, the other pieces are obviously vital.

What manuals do you feel are based on poor history? I can pass along your concerns to the authors.

The writers of FM 5-0 are wrestling with a difficult problem in crafting design doctrine for the whole Army. It is challenging as there are several views on design, it's a new concept for doctrine, and it's complex.