Maybe I'm just pedantic about diction, but my impression is that a sportscar must be open
cockpit; and any closed cockpit car is a grand tourer. Both are sporty, but the roof makes for a clear distinction in classification. Its a historic racing thing.
So a Boxter would be the sportscar, and a Cayman is a GT based on the same platform; most people just use the term loosely and over time its meaning has been diluted to the point of confusion.
I prefer fixed roofs myself, but I'm also quite strict about not referring to them as sportscars.
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