Fine-think what you like. You are perfectly free to believe that you can train hard and do lots of different exercises and do lots of sets of each exercise and go to the gym six days a week. There's no law against believing that.
But lets try an experiment before you conclude that I don't know what I am talking about. Go to the gym, warm up thoroguhly, and do a couple of progressively heavier warmup sets in the parallel squat. Then load the squat bar to the weight you normally handle for ten reps. Be sure the bar is in the power rack so you are protected if you get stuck at the bottom. Don't actually do any squats - just load the bar for now. The squats will come later.
Next, load another barbell to your regular ten rep weight in the stiff legged deadlift. If you don't do stiff legged deadlifts, load the bar to twenty pounds over your ten rep poundage for bent-over rows. If you don't do bent-over rows, load the bar to fifty pounds under your squat poundage.
After that, go to the bench press and load the bar to twenty or thirty pounds UNDER your best poundage for ten reps in the bench press. Ask a friend to be ready to spot you on the benches.
Now you are ready to do the experiment. Take the squat bar - the one you have loaded with your ten rep poundage - and do THIRTY REPS. I don't care if you have to stop and catch your breath...I don't care if you collapse during the set...I don't care if you can't get up from the bottom position and have to crawl out, strip the weights and re-position and re-load the bar. I don't care if it takes you ten minutes to finish the set. I don't care if you vomit half way through the set. Just do the set. Thirty reps. Not fifteen, not twenty, not twenty-five, but THIRTY. Not one rep less. And each rep must be a complete movement - none of this sissy quarter squat or partial movement nonsense. Go down until the tops of the thighs are parallel to the floor on each and every rep - and if you don't go low enough, the rep doesn't count and you have to do it all over again.
When you finish the squats, stagger over to the deadlift bar. If you have to stop and puke, do it, but don't waste time. Grab the deadlift bar and knock off twenty reps in the stiff legged deadlift. Control the bar all the way up and all the way down. No halfway movements and no bouncing the bar off the floor. Once again, stop if you need to stop, but do whatever it takes to get all 20 reps.
After the deadlifts, go to the bench and grind out ten reps in the bench press. (Be sure you have a spotter!) Do the reps consecutively if possible. If your partner has to strip some weight off of the bar, that's fine. Just don't spend all day unloading the bar. If you have to stop to catch your breaht, do so. But don't get off the bench until you do all ten reps.
Next, jump onto the chinning bar and do fifteen perfect chins. Do as many reps as possible in consecutive fashion and then grind the rest of the reps out in rest pause fashion.
To finish things up, grab a 150 pound sandbag and walk around the block with it. Hold it in a bearhug for the entire distance. If you have to stop and put it down to catch your breath, that's fine - but remember, every time you put the bag down makes one more time you have to lift it up again. If you don't have a sandbag, two 60 pound or 70 pound dumbbells will do nicely - just hold one in each hand and go for a walk with them.
After the sandbag or dumbbell walk, you are finished with the DINOSAUR portion of your training routine and are free to do any other exercises you think are necessary for a "well rounded" or "balanced" training program. You also are free to do as many sets of the other exercises as you wish. Heck, do two hundred exercises for ten sets each if you want.
Of course, if you have puked your guts up after the squats and passed out cold after the deadlifts, puked again after the benches and hit the ground for twenty minutes after the sandbag walk, you may not feel like doing any extra exercises. That's ok. Remember, we are doing an experiment. You are learning a very valuable training principle. You are learning exactly how little work you need to do if you are training HARD.