I can only partially agree. Honestly no disrespetc intended

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Whilst splits have long been proven to work. Most natural lifters at the bigger end of the scale, around 190-200lbs+, could maybe get away with 12 sets on big muscle groups, particularly Chest, but you implying 3 sets of 5 exercises, or basically 15 sets per muscle, is almost certainly into pro-hormone country, if not Steroid use.
Most seasoned people with a natural approach to weightlifting, attempting 15 sets on a muscle group, would seriously have issues doing it, and maintaining intensity per workout.
Even if they could continue that long in a workout, the final few sets, would probably be completed with about 50-60%, rep numbers of the earlier ones, possibly less and potentially induce overtraining and possible issues with fatigue, immune reductions, sleep problems and inadequate recovery, causing very bad dropping off of performance levels, within as little as a month.
You're also looking at possible problems with CNS and PNS, when you're potentially over-stimulating the Motor Cortex and particularly areas like the Thalamus, that help govern motory and sensory function.
As I say, no disrespect intended, as it's good to have you on board

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