I own both those Cane Creek ends and the older version of Spirgrip inner bar ends. I don't love the look of the CC on wide bars, but they do help. The Spirgrips are unlikely to ever leave whatever bike I am going to use for lots of climbing. Last week at Blackstar, I saw a guy rocking the ti version of those old school Onza bar ends. They could almost double as hand guards. Got a special place in my heart for Onza bar ends.
Biopace =/= modern ovals, thankfully. I had Biopace on my '89 Stumpjumper, and it was part of what made me go 1x even back then. I like the new ovals, (But I think the best benefit comes from switching back and forth between round and oval.)
I miss short cage RDs. I'm stocking up on Zee, (essentially short cage SLX) but 10 speed parts are going away. I realize dinner plate cassettes require a longer cage, but I'm fine with 38-42 max, and those don't need 52t-capable-draggin'-in-the-dirt cages. Maybe in a few years, they'll make AXS ThuperBooseDoublePlusGood HighClearance Mini-cages as the new "Innovation" (Or we'll all have gear boxes?)
Mostly, though, I'm happy to see bad stuff going away. Coming from BMX, I never understood why it took so damn long to shed the roadie tech/knowledge that infested mtbs since the beginning. Quill stems, canti brakes, skinny rims, and absurd, crotchbusting standovers never need to come back. Hell, when I got back into the sport in 2014, I was shocked that we weren't 100% tubeless, 1x, and wireless drivetrained. I'm a classic late adopter, but even I had a bluetooth phone in '05. Seems like we should have had AXS back in 2010.