I am basing my views on what i basically want the future to be like, which is technology similar to the expanse, which i am basing my entire concept on. You seem to trying to debunk my idea on how warships will be designed. With technology like the expanse, ships would turn towards somewhere, accelerate and then flip around half-way there and start to decelerate. Because of the power and efficiency of the engines used in the expanse, that design is feasible, but with modern day technology it is not. About just having small thrusts, if you had a large cylindrical ship, you would still need some thrust to get it spinning,, with drag or not. Unless you have magical friction-less surfaces, you still to occasionally speed it up again to keep gravity. Spin gravity at the current time is our best but only option. I was mostly thinking about warships, and i see having spinning sections would be harder to manage in a battle.