For years, Acura approached the evolution of its vehicles with the deliberate patience of a carpenter wielding a sanding block. Rough mechanical or aesthetic edges were banished not with axe swings, but with small motions that seemed barely perceptible compared to the ranging whims of the competition. Then the 2009 TL came along. While the automaker had already begun to dabble with its then-new corporate shield grille, the TL took the piece and ran...