Just some thoughts.
Much as I appreciate this iron insight, I can't say I always adhered or come back to it enough; put simply, 'make every rep count'.
This has got to be, I believe, a big part in crossing the line from lifting and being in good shape and bodybuilding (or powerlifting) lifting.
Maybe form overall is ok, but sometimes I'll think say, rep 5 or 7 or both were half assed because I maybe didn't squeeze at the top, or go low/deep enough or kind of let the weight drop a bit vs lowering it; any number of things. Not totally mentally, physically sloppy but not disciplined, focused throughout the set. Sort of easier said than done, but still, that can't be an excuse.
Even if it means stripping the weight 10, 20 or whatever lbs, even for an old guy who's lifted long enough and should know better, the idea of racking up as many 'perfect' sets in session......that requires making each sets' reps all count; seems like a fresh concept.
It's gotta be more than just cranking out x sets times x reps per set @ some big number weight. If you're going to craft your body, gotta treat pumping the iron as a craft to hone and perfect (I'm telling this to myself; not lecturing any of you).
Just my 1c.