Humans are social creatures. Perhaps the stereotype of the energetic and motivated individual is an anomaly of human behavior. Some degree of "loafing", to use

Humans are social creatures. Perhaps the stereotype of the energetic and motivated individual is an anomaly of human behavior. Some degree of "loafing", to use the OP's word is natural and healthy for individuals and the group as a whole. Slack time allows recuperation, thoughtful planning, and enables available team members to unblock members that are stuck. I say "some degree" of course. Pathological examples can be found.