You will recall I mentioned earlier in another thread that I benched 285 for one rep in a gym competition in 1992-3, when I weighed about 145. I was probably at my strongest then. At that time, I normally did weighted dips with 75 pounds on the belt for 10-12 reps. (I think it might have been a bit more weight on the first set, but I can't get the picture of three 25-pound plates on the belt out of my mind, so let's go with that.) While the total weight is less than my one-rep bench, it was pretty much in line with my bench for reps. In fact, I started my bench press with a higher weight than 220, but for about half the number of reps.
Fast forward to the late '90s, and I was no longer doing bench with free weights; I was using the Smith machine because of my shoulders. At that time, I recall wanting to up my dip weight and went to just over 100 pounds of added weight on my first set for a very brief period (a couple of weeks?). 105 comes to mind, but I can't be sure. And it was only for about 5 reps, before I started lowering the weight for subsequent sets and upping the reps a bit. That was still more than I could bench on the Smith machine for reps.
It was in 2012 that I seriously started revamping my workout routine, because it was too much volume and, possibly, weight for me at that time. But I distinctly recall being able to characteristically do 14 reps with 70 pounds on the belt, a 45 and a 25. The reps were full range, but they were fast. I couldn't finish them quickly enough. My weight was in the high 130s then. It was a different gym, and I was no longer using a Smith machine for bench press, but a Nautilus-type machine. I was dipping more than I was "benching," and I was dipping with free weights.
Perhaps it's because of the nature of my compromised shoulders, but at least in my case, I don't think you can make that generalization.
As an aside, since 2012 and up until a number of months ago when I started doing very slow reps with only body weight, I was using a 65-pound dumbbell, which I held between my legs just above the knees, for 8-9 slower reps than when I was previously racing through them, but not as slow as I presently do them unweighted (obviously). I got tired of carrying the belt around with me in the gym (along with my own handle for pulley rows because the gym didn't have the kind I liked). That was when I decided to go full Thoreau.