TR7s developed a poor reputation related to reliability issues, but our focus is on its styling.
Triumph's previous model was the TR6 that shared the same body as the TR4 of 1961, so the line was long due for upgrading. Its styling theme was that of a wedge featuring a tapered hood profile, a high, squared-off trunk and a raked-back windshield. This was before aerodynamic efficiency became a key element in body shaping, so the wedge concept was probably more a thematic notion than a science-based exercise. That said, the windshield and the headlights, when retracted, were probably helpful.
Otherwise, the wedge shape was only marginally successful on the TR7 due to its short length: its features were too cramped.