Ive got the Anvil Foundry and was lately wondering why or if, I would actually need the small batch insert they sell for 2-3 gallon batches? I mean, I can see it blocks off the side mesh on the grain pipe, but why? Why would I need or want to do that? Something Im not getting about the function of that insert or small batch brewing in general? Anyone do a 2.5 gal batch in the Foundry without the insert?