I've watched many comparison grows using extreme defoliation as a technique and can confirm that, done right, it can certainly increase dry yields. Why would this be if the Ferrari got a Toyota engine swapped into it, to use your analogy? Mostly because the processes that happen are much more complicated than most of us understand. The study I linked in the previous post is a good example of this. What seems like a common sense thing many times is counter to what we think is happening.
I understand your explanations and how you could come to those conclusions. I am guilty of the same things.
I've been cultivating cannabis for over 30 years, started in the early 90's, both personally and on a commercial level. I had the luxury of having testing facilities at my disposal along with getting to watch comparisons live. I still get surprised by things that I was taught early on that are not true and things I observed and came to conclusions on that I learned later were completely wrong. In my early days of cultivation all of my knowledge was based on hippy grower knowledge that was passed to me. When cultivation became legal I got to work in more controlled environments with degreed professionals that I could tap into so my cultivation knowledge base consists of anectdotal knowledge culled from years of observation and scientific knowledge.
What I've learned comparing both is that my early knowledge was based on the same principles you use to gather your conclusions. Some of that early knowledge was refuted early on pretty easily once I was in a more science based environment. Some of it proved to be accurate. Almost all the science based information proved to be true hence why I rely more on scientific information rather than anectdotal observations. Can science be wrong? Certainly. Scientific hypotheses are refuted every day but the percentage right from wrong in science is markedly less than in anectdotal observations.
Everyone should do what they think is right when growing but try and back up those observations with scientific information to confirm what you think you are seeing. Not only will you be surprised at how assumption can be a dangerous thing but how quickly your grow skills will improve after you've cleared away the inconsistencies you are using as fact.