I've been wondering about this for a while now. These various Ward abilities from BOT and MIN have the effect of "increases shard/crystal/cluster yield by two" for 400GP.
On a normal node (so 4 hits, and assuming no Nymeia's Ward procs or node bonuses):
Ward ability: I would get 12 shards.
Bountiful Harvest/Yield II at yield +3: I would get 16 shards.
Why would I want to use Ward abilities if I can use Bountiful Harvest/Yield II and get more for the same GP. Is there a situation where I want to use these or are they useless?
I suppose you could use Ward + Bountiful II and get 21 shards out of a node, but that requires 700GP. With that you can just use Bountiful II on two nodes and still get more shards. To me it seems like a high GP cost ability for little gain.