Hot bus items can be load-shed; while the bus can't be interrupted with a switch in most cases (some, it can, but these are the exception).
An installation feature of all electrical circuits is a requirement for circuit breaker protection (not to protect the component, but to protect the wiring). Where resettable circuit breakers are provided, the hot battery bus items can be disconnected. Many hot battery bus items are controllable by switch, as well.
The bus isn't usually controllable by switch, but the specific items on the bus generally are, and can thus be interrupted.