Why are t-top cars extremely rare? Does anyone still make them? If not, why did they stop?
In addition to the problems mentioned, t-tops are also pretty inconvenient to store when you remove them. It's a pretty bad solution compared to something like a power retractable, which is all the rage now.
They were never very popular outside the boy-racer market segment, which includes all the cars you mention.
Just FYI, the Corvette still has a targa top. I wonder if it's the only targa still being made.