Must be real nice to work in an environment where you can carry the saw the same way every time.
Unfortunately we don't have that luxury in the woods.
If I had to engage the brake or shut the saw off when moving around, I'd have starved long ago.
Besides, when have anybody been bit by a stationary chain?
Or does your saws all of a sudden rev up on their own and start chewing on the nearest meaty object?
Mine are all vegetarian, like their owner, so I don't have that problem.