Interesting sidebar discussion.
Just the kind of thinking the "founders" of the Genre wanted to foster.
Btw, among the "impossibilities" bedeviling the physics establishment is the EM Drive and it's kin. Very unlikely to lead to a practical reactionless drive but there is some weird physics going on in those gadgets.
https://en.m.wikipedia.org/wiki/RF_r...avity_thruster
The whole thing strongly echoes this Lee Correy story:
https://www.goodreads.com/book/show/549128.Star_Driver
Fun one.