No it's not. It leaves out many of the biological details, but it is enough to go on to actually manage one's programming
Which matters how? You will trigger protein synthesis multiple times as the SRA curve gets longer. You do not need an all of the stress that adds up to an overload event in order to stimulate protein synthesis. The threshold is actually pretty low.
Define fully recovered....which I also never used anyway, because I don't even know what that would mean.
You need to be recovered from fatigue enough to display a new PR because the fatigue may mask your increased strength even if you have the made the adaptations necessary to gain that strength. But just because you are no longer substantially fatigued from the last session or sessions doesn't mean that you have applied the stress with those sessions to improve strength.
Everything takes longer as we advance. Applying the stress takes longer and recovering from it takes longer. And even though we do improve our recovery abilities as we advance, the stresses that need to be applied are so much higher that it almost becomes a moot point. Assuming that a novice and an advanced guy are similarly conditioned they are both going to be near equally fatigued from relative levels of work per session.
Time isn't the metric. Increased strength is. It is not hard to determine that it takes a novice much less than a more advanced lifter to build the same 1-2% increase. To get from 315 squat to a 320 squat as a novice takes 4725lbs of work (not counting how deadlifts and other things might contribute) , which happens to all be done in one day. An intermediate on HLM takes 12,000+lbs of work to make the same progress.
Not terribly hard to see which one is more work to me.
Eh, no.
The LP layout is training MWF or TuThSt or whatever and getting new PR's every day you train a lift. You cannot do this even with your deload because you need more recovery....unless the only issue was systematic fatigue rather than not enough stress. But if the stall is from lack of stress and you add more of it, but you don't need more recovery, then you should still be able to squat on that schedule with continued PR's every session and as soon as you cannot it is because of under recovery. This is what happens when the light squat day happens: you add stress, but you also add recovery because they are not on or off buttons. They are happening together.
You now need two days off to recover from 3x5 at the work weight + 2-3x5 at 10-20% less. That is more work in a now longer SRA curve, but it is also more recovery.
Managing fatigue is recovery and there is plenty of that going on during an 8 week block.
I get that you don't understand, but that doesn't make anything I've written hand wavy. You just don't get it. Time matters in the sense that the same overall workload spread out enough does nothing and the reverse causes overtraining, but the appropriate spread in the SRA cycle of the individual lifter, not a day or a week or anything else.