There’s been a lot of record-keeping on drop rates, and I don’t think there’s any evidence that drop rates are reduced. Perhaps @BarryWuzHere could weigh in, and correct me if I’m missing something.
What seems more likely is that the new content–like Trials–is putting more pressure on your material consumption. Increasing titan star levels can also add a lot of pressure.
The Barry Farmz Here guide is the best integrated reference on how much of what drops where that I’m aware of:
