U.S. GAAP and IFRS accounting standards are converging. Since this is the case, why would a manager

Question:

U.S. and IFRS accounting standards are converging. Since this is the case, why would a manager need to understand the historical differences between these standards?
GAAP
Generally Accepted Accounting Principles (GAAP) is the accounting standard adopted by the U.S. Securities and Exchange Commission (SEC). While the SEC previously stated that it intends to move from U.S. GAAP to the International Financial Reporting Standards (IFRS), the...