Hmmm. 25 years ago (okay it was really 30+ years) I weighed about 165 lbs and remember dancing over boulders with a 90 lb pack as I headed out for a 10 day climbing expedition.
Now, I carry a 30 lb pack for a similar length trip. I have gained about 35 lbs in body mass. So I have a net weight loss of 25 lbs. I travel more slowly on much tamer terrain with significantly less elevation gain and my joints hurt more. It's not fair. I'll take back the old technology and extra pack weight any day if I can get the rest that went with it . . . okay, there is a peaceful joy and confidence I get now that I wouldn't want to give back.
In the end, thank you all you engineers and pioneers, and BPL types that have helped me keep going by lightening my load!
P.S. I still use my original Thermorest from 1979, but I did buy a NeoAir Xlite last year to save pack volume. I don't like it as well as the old one for comfort.