Us pro brewers are most interested in mash/sparge efficency. I want to know what my mash/sparge process is doing on a consistent basis. what goes into kettle pre-boil. That tells you what your getting out of your mash-tun, brewhouse efficency has so many variables, i.e hot & cold break,shrinkage,amount of hops,filtered or not,etc. I still want to know brewhouse eff. to see my BBL yield, with that said you want to know if you run X amount of water through X grain and get 1.xxx gravity into kettle. This is what will accurately tell you what your getting out of your induvidual mash tun, and is what i punch into beersmith. If i rely on what goes into ferm./bright tank isn't going to tell me what i'm getting out of mash tun consistently, there's to many variables after pre-boil. This is assuming full volume boils of course. Cheers!!!