A Targa would be something I'd love. Hate that we don't see those anymore and I really think they're amazing. One piece, on/off, stow away in the trunk and call it a day.
It might have been unpopular among buyers as goes for most reasons that certain features get dropped. Easier to make it an option on a vehicle from a brand that was historically known for it.
After all Porsche does it and they have done it for many years on the 911.