You want some BS pitfalls? I'll give you two big ones:
Efficiency is 'to the fermenter'- Read up on this, and how you would have to deal with changing your efficiency if you adjust your trub loss per recipe, or ever. Or, just set 'trub loss' to '0', and use the much more appropriate 'kettle efficiency' and a batch size of what is in the kettle post boil.
Batch sparge and BIAB efficiency- BS, and most other packages also, don't handle batch sparge or BIAB properly. According to the physical laws of the universe, your efficiency decreases as OG increases, when using these sparging methods. BS has no good way to accommodate these styles, and, even worse, leads you to incorrect values if you leave your efficiency static (as they recommend).