I'm starting to think that we're talking apples and oranges here.
The peacetime training system is the wartime mobilization training system.
I don't think so. The peacetime training system is the "core of" the wartime mobilization system. It is not the entire system.
It must have capacity to meet 100% of peacetime throughput requirements
We agree on that.
or it will not be able to meet wartime surge requirements,
A system built to "meet 100% of the peacetime throughput," will be inadequate "to meet wartime surge requirements" by itself. It will need augmentation.
and we certainly cannot plan to gut the field force to augment training systems at the moment we are mobilizing.
I think the problem we have here is that the CA thinks continuously in the context of what B-GL-300-008 "Training Canada's Army," calls Mobilization Stages 1 and 2 (unit to brigade limited sustainment), View 2 type of operations (mix of combat and non combat e.g. Rwanda to Afghanistan and peace time Latvia). Effectively, these were and are brigade (-) level, limited sustainment rotations utilizing the 3 stage (now 2 stage) force generation cycle. If that was all that is needed to be planned for then, in those those circumstances, I would agree that the RegF field force is caught up in their own training cycles and the individual training system should be set up to primarily handle all initial and continuing training requirements for individuals. There will be circumstances, however, where mini surges will require field force augmentation and that possibility should be foreseen and built into the force generation cycle.
The reality is that there is also contemplation in the CA's doctrine of the less likely View 1 operations (intense combat and general war e.g. Korea and WW2) in the framework of Mobilization Stages 3 (brigade sustained) and 4 (brigade and echelon above). Stages 3 and 4 "envision the commitment of forces beyond current capabilities and would see significant expansion of the Reserve component." Clearly, the peacetime training system is inadequate to meet Stages 3 and 4, View 1 operations and needs augmentation to be able to surge to wartime outputs. That means part of any current field force structure and any mobilization plan requires that during planning, a slice of the field force's personnel and equipment are designated to "be left out of battle" to augment the training system.
Effectively, the size and structure of any army should include: a) a training cadre designed to supply 100% of the army's Stage 1 and 2 mobilization peacetime training throughput; b) a field force designated as the maximum deployable force for peacetime Stage 1 and 2 View 2 operations up to the outbreak of View 1 hostilities; c) a further trained portion of the field force designated to i) provide immediate sustainment and enhancement of the deployed field force; ii) augment the training system to generate continuous replacements needed by the deployed field force; and iii) to augment the training system further to expand the overall size of the deployed field force over time under Stage 3 and 4 mobilization.
You do not "gut" the field force; you structure it beforehand to have very specific components and tasks for all four stages of mobilization.
During the 1990s, and up to 2014, it was quite appropriate to prioritize for Stage 1 and 2, View 2 operations, however, it was, IMHO, negligent on the part of the CA to almost totally ignore emplacing plans and structures to cater for Stage 3 and 4, View 1 operations. With the current world outlook since 2014, that continued neglect, IMHO, borders on the criminal.