It's version 1 of the recipe formulation. I was trying to keep it simple and present everything on one screen.
As a long time all grain brewer, there's just a few things I care about with regard to recipe formulation:
1. hitting my target gravity
2. calculating IBUs
3. notes on yeast & ferm temp
I used to use ProMash, but was tired of keeping an old Windows box around for that. In ProMash I never used any other recipe features.
I wrote BrewBot for what I needed and wanted.
Let me know what features/tweaks you'd be interested in seeing.