This isn’t correct. Reuseable elements can still do things even when not visible. Data won’t be loaded unless it’s visible (i.e the repeating group is visible, even if you can’t see it) or referenced, but invisible elements absolutely can do stuff (you implicitly know this already if you use group variables in popups).
Setting a state doesn’t cost WU, but retrieving data to set the state would cost WU.
All of the possible results are downloaded to the client and then it is filtered client side, so avoid intersect with if you can help it.
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