A reconciled bank account and a profit and loss statement are the floor, not the finish line. Real estate operators and syndicators run on partnership taxation, and partnership taxation reads the books as economic substance. If the chart of accounts does not separate distributions from expenses, if contributions are buried in a catch-all, or if intercompany transfers are coded as income, the year-end return inherits every one of those problems.
The cost shows up later. A bookkeeper who does not understand Subchapter K produces books that look fine on the surface and fall apart when a CPA tries to build a Form 1065 and a set of K-1s out of them. The reconciliation work that should have happened monthly gets compressed into the weeks before a filing deadline, and planning opportunities that were visible in real time are gone by the time anyone looks at the numbers.