When one gains bodyweight, the potential for absolute strength increases, however the potential for pound for pound strength decreases exponentially. I don't know the science behind it, or I'd go into more depth, lol....a 150lb guy deadlifting triple bodyweight is at 450, an excellent lift, but a 300lb guy deadlifting triple bodyweight is at 900, and that makes him one of less than a handful of guys who have ever breathed.
A good lift is a good lift, and a gym ass clown is a gym ass clown....for every fat guy bouncing more weight than he can handle off his chest, there are just as many skinny guys raising their ass a mile off the bench and having their spotter row more weight than they can handle off their chest......but, I do agree, a respectable lift with good form is what we're all discussing here, and regardless of bodyweight and formulas and numbers, anybody lifting heavy (heavym or just heavy for them) with solid form has my respect.