The gravity ranges. Weather or not you can make lagers. It's just my experience that the gravity and efficiency and decoctions are just as doable in BIAB vs traditional all grain 3V setups.
The qt/lbs ratios and advise given is not exactly my straight nerd experience either. Direct fired mash stepping in BIAB is very doable.
My most recent BIAB was 17.8# in 14 gallons of water with 80.8%BH efficiency.
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