Sounds like you've nver been in a Lotus or VX. Cold never, in fact air conditioning in summer is almost a must. Exiges with no air con can't be shifted by the dealers. It's a small car, mid engine which means plenty of heat in the cab. As for quick, you are missing the point. The Lotus chassis is not about how quick in a straight line, it's more about driver feedback, handling and enjoyment. That's why I say it would be missed if sold.
I owned a VXR220 (number 20 of 65) for almost 2 years, which was even more basic than your Exige
Not an issue in the Exige, but in the Elise variants it's bloody cold with the roof off and the heater is more of a blower, but I'm sure you'd know that as well as anybody. I'm also going to assume your car must be garaged so you've never experienced the unbridled joy of ice forming INSIDE the windscreen when it's freezing outside, and it then takes aaaaaages to warm up. To say that a 116 N/A isn't as quick as a 350 is missing the point, and I did already mention that the Zed isn't as far behind the Elise chassis as you would imagine once you get used to the differing layout. Is it as pure? No, of course not, but it's warmer and comfier and far more fun that I expected.