Well yeah "Structured Walks" are important,but they are more about building discipline and a bond then "exercise??"Yup. seems a pretty simple step from where the OP is at. Be a bit tougher if they had a jumper, puller, dog reactive etc. Like you said, the structured walk is really not about exercise.
The dog /puppy seems to do well on leash, and has no dog reactivity issues?? But does he get a chance to run?? Boxers can hit somewhere in the low 30 mph range. I wonder does this dog get a chance to run???
I did not think the "walk thing could be overdone?? But maybe it can?? Raising a well behaved dog properly is all about "balance," "Walking your dog is extremely important but it's not "everything."