Ah. So, if i understand this correctly, the omission of heavy ass motor pattern practice is the cardinal sin in my hypothetical; this would make sense intuitively, that without the adaptive stress of the 380x5, the hypothetical example I put out is forgoing not only the ability to put another PR on the board, but also and perhaps more importantly, the specific skill of lifting ever greater weights in the 1-5 rep range.
Correct?