You guys bring up a good point. I see a lot of folks getting the wrong tents. Bigger isn't better as you describe.
The Maggiolina you show is a good example, a specialty "Maggiolina" about 4 inches shorter than standard for cold weather. The rack on top is designed to put all your wet gear and stuff you don't want in the tent. You can put gear bags, or a friend in central America told me a place for the monkeys to sleep. Great tent, but you have to sleep diagonally if you are much over six foot tall. The small space, low roof, insulation makes it about 15 degrees warmer inside with two people all buttoned up.
Years ago these tents used to all be made by special order. Because of such a long supply chain, almost all now are made in advance and warehoused on location. This is OK but the problem is when you get "sales" involved and the difference in price between a small tent that weights 90 pounds and a large that is over 165 pounds isn't mentioned in the upsale. Very few vehicles are designed for 165+ on top and it really drags down performance.
The generic tents coming out of China, can be OK but they are built to a price point rather than a service level. They also tend to be sold by retailers that aren't as experienced. I see a lot of vehicles in our neighborhood with these big folding tents on their racks full time. I would have steered them to another tent as they really aren't designed for that.