let me put it like this
X movement trains A, B, C, D and E muscles. It recruits A at 20% efficiency, B at 20%, C at 20%, D at 50% and E at 100%. Now, which muscle got the most mechanical tension? which muscle got the most stimulus? If you go at 0RIR, which muscle would grow more over time? E obviously, with A, B, C and D lagging behind
Now because X trains so many muscles it is a very fatiguing and taxing movement that limits your energy for the rest of your work out.
instead let's say that you have Y, that trains A at 80% and B at 100%, and Z that trains C and D at the same rate. Thus they allow you to train those muscles at a better recruitment rate with more energy to spare in other movements.
this is the logic behind the limitations of the DL. You have to target the muscle to make the muscle grow. The DL targets no specific muscle, which makes it a bad movement for your quads, hams, lats, calves, or biceps. If you wanna grow those muscles, you are better off training those muscles than dicking around with the DL, unless you like it and you just wanna do it. That's fine too
but my point is that it is not an efficient movement for hypertrophy. You get very little in return for a whole lot of systemic fatigue
