…imagine not being able to change your own tire…
Once a bad theory is adopted because it makes sense to one cohort (GOFOs who went to a two-week MBA camp) and is encouraged by others (influential civilian companies looking for another income stream), at the expense of what the first cohort should have been focused on but is an unpopular topic (winning wars), it spreads and develops its inertia.
Even when one area discovers the theory does not survive contact with reality, other areas carry on because, well, going along is easier than admitting error and changing.