Easy, they're filled with more mechanics and less combat stuff. They're dogmatic, everything is set in stone if you do the mechanics right, which gets boring. There's no panic, no sudden spikes of action all of a sudden like D1 Raids. Stop bombarding Raids with more boring mechanics and fill them with pure action. Example: Crota Fight The only mechanic there is the Chalice of Light, and you could argue grabbing the sword too but you use to attack so is more of a combat mechanic. Everything else in that fight is enemy placement and the Oversoul, which you also just have to shoot to get rid of it. Not just play a minigame of Kids Train and tether here and there like GoS.