Yes, there's a neat simplicity in how everything in accounting must work out, but extrapolating from that into "P&L, balance sheet, etc. can represent what's go

Yes, there's a neat simplicity in how everything in accounting must work out, but extrapolating from that into "P&L, balance sheet, etc. can represent what's going on in any org in ways that can be roughly comparable" sounds like a very financialised worldview. There are many important aspects of organisational design that are only loosely correlated with financial statements.