something being cool does not contradict it being unbelievable, if anything, if I pull some unbelievable stunt, that is pretty cool
My problem with allowing it is the believability, not the coolness
"Believability" is a weird and very malleable term when dealing with D&D!
I mean the fact that time travel is "believable," but a noble being able "act noble" in the past or a criminal being able to apply his criminal no-how in the past is NOT believable? That has me really scratching my head!