Our
T@B is the Clamshell model with the outside kitchen for the reasons many state here. We like to be sociable when we camp and being outside is where we want to be. As for the "brew a hot drink while you sit inside" neither one of us has much interest in that. I don't mind going outside to fire up the stove even on a cold day (last year our coldest camping trip was at Great Sand Dunes National Park in April, nightly lows were in the mid 20's and daytime highs never got above 45.)
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Another factor: Cooking outside gives us the ability to expand our counter space by putting a folding table alongside the galley, which is something you can't do with an inside kitchen. In fact, we normally don't even cook in the galley, we cook on a portable camp stove on a table next to the galley. More room to spread out and the burners on the camp stove are far enough apart that we can cook two pans at the same time - something we can't do with our built-in stove as the burners are too close together.
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We always have a popup, about an 8 x 8, with us and that goes over the galley for weather protection.
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Here's a good shot of our galley setup. This was at Sunglow Campground near Capitol Reef last October:
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You can see the camp stove that sits on the table and that's where we do our cooking. Keeps the smells/grease/mess out of the trailer and gives us more elbow room to work. On the far left is the cast iron cooking table that lets us cook with cast iron without having to stoop down to ground level.
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Looks kind of complicated but the wife and I can have this whole arrangement set up typically in 20 to 30 minutes.