It’s weird - sram can release an ecosystem of groups with proprietary cassettes, derailleurs, chains, rings, that have stratospheric prices and persistent issues (speed, shift calibration limitations, QC issues, cassettes that need to be installed multiple times to settle, battery pins corroding etc etc), plus compromises they try and correct release to release. Maybe that’s ok, it’s up to the rider. At the same time, Shimano releases a new di2 ecosystem that uses their existing(and awesome) cassettes, chains, rings, has the industry leading shifter for ergonomics. A sealed battery compartment, but its perceived to be noisy on some bikes, but...