yeah and be sure to get cycling socks!
Too much sock will rob you of micro newtons of torque.
At some point you have to address the global consequence of such needless consumerism. I mean look around once in a while.
You are correct that in certain cases, a cycling shoe, cycling socks, etc. are a waste. If you apply no force at all, then riding bare foot would be no different than wearing a technical shoe.
For anyone that applies any real force to a pedal, a cycling shoe is a worthwhile and relatively small investment. If you have any doubt, try riding bare foot, (I am not suggesting that anyone really ride with bare feet). If you did, your foot would have to conform to the pedal every time you apply force. You would feel every part of that platform. You would have multiple, uncomfortable pressure points. It would contort and distort your foot. It would hurt!!!
A soft soled ātennis shoeā is a little better than a bare foot, but not nearly as good as a cycling shoe. The 5-10 shoes have a fairly stiff sole that distributes the force over a larger area, thereby minimizing pressure points and stress on the foot. The sole is made from a patented rubber compound that provides excellent grip while not getting chewed up by the traction enhancing features of the pedal.
A stiff sole is also more efficient. Think of running in sand compared with running on a track, (of course if you are tooling around with a throttle and not applying any force to the pedals, then these points are moot).
Lastly, torque cannot be measured or described in āmicro newtonsā. Very simplistically, torque requires a distance, (length), as well as a force, (newton meters, pounds feet etc.). t = r x F