Preview: 2021 BMW 4-Series Convertible is a conspicuous drop-top

The reveal of the redesigned 2021 BMW 4-Series coupe in June was, for lack of a better word, a bit jarring due to the radical new look introduced for the car's grille. (BMW also shook things up by making the 4-Series longer than the 3-Series sedan, with which it shares a platform and powertrains.) Now that the same look has been applied to the...