There is nothing casual about pushing to 3000 rating. 2400 is as you say more casual friendly if you work on it across a whole season. At least compared to raiding. Even still it is a massive time commitment once you factor in external gearing, sitting there applying to groups for hours, and all the other external things you do to prep for pushing into 16+. The reward structures are fine for how it is. We don’t need more tiers that add onto the time when the 0.1% title exists.
It creates a sliding reward curve that will alienate more players and when enough people complain they will make it easier to get and move the curve. Then we will ask for more fragmented rewards. It’s a dog chasing it’s tail game design. If you want something beyond 2400 you already have it. The 0.1% title.