I mean, we got t85s, t87s and then t87s with less damage and more accuracy. They've really filled that tier gap in tight, so unless they start releasing gear with hugely significant variations in effects, which will lead to powercreep in some area or the other or be just useless since there are far better options, you may as well just put Noxious scythe on the drop table for new content.

Power creep isn't an issue if you don't mind cycling in a gear treadmill, but they don't want a gear treadmill that turns full circle every year and nor do a lot of players.

To many people it isn't fun to know that your efforts are worth nothing in a year, that's the reason for many people who quit RS3 for ORS after all, they saw all the exp creep and MTX as devaluing their achievements.

The thing is that RS is a pretty outdated game with a clunky as hell combat system. It needs unique selling points to keep itself relevant, so if it just started doing the stuff far bigger and more modern MMOs do, it would just fall into obscurity like most other games.