I do more and more accident reports on distracted drives. Some only changing a channel or making a quick call trying to sync the phone to the car. Never done or heard of an accident while walking a dog that wasn’t dog related.
So we break it down to complicated UI’s for those only walking their dogs. Very simply UI’s for those who need light but it come’s in second to the job at hand, such as a building clearing.
Complicated UI’s for primary hand use. Easy UI’s for those using in off hand.
Complicated UI’s for those in park. Easy UI’s for those driving.