Yeah, I remember that "test" between a new DH bike and old one, saying that over 4 min it's only 20 seconds slow and that's pretty much the same or whatever. Yeah, people just don't get how giant of a time gap that is. It's common for the top ten to be within the first 5 seconds. You put them on a rig that's 20 seconds slower? No chance in hell. Same with auto racing, we are looking at dozens of cars in multiple classes, from 100hp to 500hp, racing autocross for 40 seconds all within 5 seconds of each other, in other words, they are all a lot closer here than people like to think...they sure aren't "twice as slow". You get to the highest levels of comp and fractions of seconds matter. Skills plays into it for sure, but you can't take a 20 second hit and expect to be competitive either.Getting beaten by 10 seconds and not by more is an achievement.
Also yeah 30lbs with parts like carbon rotors. 35-36 was with stuff like big ass formula 220m front rotor, saint brakes, saint cranks etc.
Though I agree with you I never felt like going lighter had that many downsides. As Gary says. How the weight is distributed seems to matter more. Plus some light parts were not as stiff and imho that had a bigger effect even if your brain told you it was the weight and not noodle parts.