With a hoist you can put multiple rescuers in but you don't have to put them all on at once. If you have an engine failure and you hoist from a sensible height, then at most you injure/kill only those that are on the hook at the time (normally one per load for us, but sometimes we 'double up' rescuers or rescuer and patient.
The guide line or "tag" line is not a necessesity, it is an enhanced capability. When conditions are so turbulent that load swing is unavoidable a succesful rescue can occur by using the line. Normally we use it for ship hoists in storms.
Precision placement is the norm without vertical reference using the hoist and hoist operator. If you want to use vertical reference and a hoist operator, fill your boots.