I played through the crucible to the end 3x. On levels 5 and 10 about a third of all loot in regular chests are always weapon and armor shards.
Started a new character and new realm. Made it to the first whisper and looted 7 chests. Already have 6 weapon shards and 5 armor shards. No gear/ armor drops at all 1 weapon only. Enemies dropped armor and a ring.