[Autumn]

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The explanation for it is that MG Shells currently interact with abilities that counteract or synergize with offensive based class skills, there is an argument to be made in the first place that swapping shells shouldn't incur tons of damage on the user as well, but that is what is being implied.

Swapping shells to minmax your FP Regen every turn can be a bit disconnecting to the class and needs habits to be formed to do so, and there is no circumstance in the world where taking EBV's damage for swapping a shell for FP simply is ever worth it either, unless you had absurd amounts of resistance towards it.