Modern kit is lighter better cut and warmer.
its definitely lighter, and warmer for the weight. But I’m not totally convinced about things being better cut – there’s loads of clever things that can be done with minimal seams, bonding etc. But i think outdoor gear is more fashion led now.
Look at general outdoor gear, loads of waterproofs seem to be cut for climbing – short jackets to fit harnesses, massive hoods to fit helmets etc. There’s a bit of a fashion element I guess, who wants a rambler jacket, and no doubt fabrics are much better, but design wise I’m not sure the features are necessary.
Even more specialist outdoor stuff seems fashion led, compare a fell runner’s bumbag to those fishing vest things with the squeezy bottles – one’s about £20 and the other £100 plus.
Having said that, its no bad thing you can go backpacking with all your gear in a 30L daysack compared to a 70l monster 20-30 years ago. And probably in more comfort too.