The promise of the "electroceutical" approach is localized neurotransmitter release: you want to enact increased ACh in the body (and localized within the body,

The promise of the "electroceutical" approach is localized neurotransmitter release: you want to enact increased ACh in the body (and localized within the body, if possible) but not in the CNS, where it would likely result in undesired side effects. You see the same phenomena in reverse with drugs intended for the brain (e.g. for treating depression). The severe side effects of those drugs are because the same neurotransmitter receptors involved in mood in the brain are involved in digestion in the gut.