I agree with most people. Advancements in the areas of weight and ibo speed haven't changed much at all. I also shot the energy 35 for a time, and it was a good bow for sure. There were light bows back then, and there are light bows now. "NEW" stuff now in weight developments have gone into proprietary allow blends in the riser....Xpedition, Bowtech, Truth archery (maybe others) all have a bow with some blend of magnesium in the riser to reduce weight. Of course you are going to pay $1600 -2K for that.
Speed-no real change in my opinion for developments. Bows are faster now in general for sure, but there were fast bows back in the days of the E35.
Personally ,the tuning tech has been the real advantage and where I see the most innovation. Most bows now have some tuning tech either with limbs, cams, roller cable guards, and even timing adjustments. Now old bows you could tune some of this as well, but it was just more difficult. I like to tinker and tuning is much easier now...but you don't have to buy a "new" bow for this to a degree. I'm shooting a 5 year old bowtech (bowtech revolt x) that has deadlock tuning system that all their new bows have now. Of course the newst bows have even more tuning options, but you can go a couple years back and still get a variety of tuning tech...