No knock against pound4pound (I haven't read many of your posts), but I would tend to agree. Look at John Davies workouts. People would always criticize him for his high stress workouts, but you know, he produced great results (whatever you think of unstable surface training).
Up until modern equipment, farmers had to do high stress work every day, all year.
Or the Bulgarian O lifters.
Or european strongmen.
Or elite military units. Sure, different kind of stress, but if you can make it through the blitzkrieg and mental breakdown of BUD/S and Hell week, you can do anything.
90% of all overtraining is mental.
Besides, that's what off weeks are for.