Obsessive compulsive disorder appears on the Border Collie's condition list, and that is unusual enough to be worth pausing on. Most breeds' lists are structural or systemic. This one includes a behavioural disorder because the breed genuinely develops it.
An under-employed Collie does not simply get naughty. It develops repetitive behaviours: shadow chasing, light chasing, flank sucking, spinning, obsessive fixation on wheels, water or reflections. These start as boredom and become genuinely compulsive, at which point they are hard to extinguish and sometimes need medication alongside behaviour work.
The requirement is mental more than physical. A Collie that runs for two hours is a fitter Collie with the same unmet need. What satisfies it is being told what to do and doing it well — agility, herding, competitive obedience, flyball, scent work, or serious daily training at home.
The Akita at 3/5 wants a decent walk and then lies down heavily somewhere inconvenient. In a household with a full-time job, that difference is the entire decision.