I agree with your basic point, but IIRC 1 BR Corps became the ARRC - did it not? Basically the ARRC is built on what the UK knew about the Corps level of Operations. I'd also submit, that Corps level operations are extremely theatre and context specific.
If you're telling me that UK's understanding of Corps level operations is not what it was, I'll take your word for it, and ponder as to why.
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