I see what you're saying Eric.
This is a malleable way of training for sure. I've had to adjust Monday upwards and downwards to keep Friday moving as well, usually between 3 and 7 sets depending on fatigue and perceived effort. Even then, I was still only able to do about 8 weeks before feeling generally worn out and sore, and not even all of those weeks were in PR territory.
I think one of my mistakes in the past was just trying to hit a heavier and heavier 5RM every Friday, never alternating or cycling my PR attempts. I think that was part of the reason I never saw more than about 8 weeks of straight training before feeling generally worn out, both physically and mentally. As you said, the Intensity day is stressful as well.
I still can't imagine going 20 full weeks straight of heavy lifting. I don't think my joints could handle that. Perhaps I'm just not cut out for that long of a run? Did you mannage to handle it fine?
And no offence taken. I'm used to people laughing at me

Good advice by the way.
Cheers,
Jeff