Are you a powerlifter?
Dorian didn't squat. Loads of guys don't bench. How old are you?
Do you know some people who have been training a while get injuries?
Isn't Tom Prince in particular renowned for his strength? I haven't seen you but you haven't been on the Olympia stage have you? Isn't BB about looking good not being a fat power monster?
dorian squatted for several years, then started to rely more on the legpress (due to injuries), but even then he did do smith machine squats now and then.
and both prince and bob used heavy ass weight on free weight exercises when they were coming up, but there comes a point for the huge drugged up guys when the benefit vs risk ratio tips over when it comes to free weights usage thus you start using machine exercises more and pre exhaustion techniques. also the laziness factor comes to play after many years of gutbusting lifting.
and finally, if you can get your incline smith machine press to go from 5x200 up to 8x315 your chest will grow. dont have to use free weights for that.
also , the drug users can always just up the dosage