And it would be bad for a submarine salesman to go to people that think swimming is very special and try to get them believing that submarines do swim.
Why would that be bad? A submarine salesman convincing you that his submarine "swims" doesn't change the set of missions a submarine might be suitable for. It makes no practical difference. There's no point where you get the submarine and it meets all the advertised specs, does everything you needed a submarine for, but you're unsatisfied with it anyway because you now realize that the word "swim" is reserved for living creatures.
And more to the point, nobody believes that "it thinks" is sufficient qualification for a job when hiring a human, so why would it be different when buying a machine? Whether or not the machine "thinks" doesn't address the question of whether or not the machine is capable of doing the jobs you want it to do. Anybody who neglects to evaluate the functional capability of the machine is simply a fool.
Don't you think they're an exemption because they're alive? If seals had propellers we'd still say they swim. Squids use jet propulsion and we still say they swim; do jetskis also swim? Somehow not.
And submarines don't swim.