A moment’s levity. Yeah, I agree that some breeds shouldn’t exercise off lead, but it’s tricky to define which ones: sighthounds aren’t intimidating however large they get, so it would be a shame to do it by size, and there are some super-placid big herding dogs which you’d want to keep out of scope. So you’d have to do it by typical breed behaviour which is a little unfair to some very well-behaved dogs. Off-lead exercise is essential to wellbeing, I think, although my only experience is with a working cocker.