Nanomachines that do resemble scaled-down versions of macroscopic machines can’t be fabricated using today’s laboratory techniques, but they can be simulated with good accuracy using molecular dynamics methods. The results fit the scaling laws quite well (high frequency motions, enormous power densities, etc.).

There is a naive mythology that says that machines of this sort are somehow inconsistent with biology, when they are in fact merely different. Regarding the significance of that difference, it’s important to keep in mind that cars and aircraft don’t closely resemble horses and birds, and outperform them as measured by several metrics of practical importance.

What the hell does that even mean? And why are you writing like you’re Macbeth on an internet forum?