I agree.
While I've never raised BPs, I've raised many other kinds of hatchlings & neonates, and yes! they are programmed by "nature" to seek live wiggling prey...NOT 'roadkill'.
So while some may switch quickly & easily, others cling to their instincts...it's up to us, their keepers & benefactors, to realize & do what they need to get a start in life.
It's not easy to make dead prey seem alive...many of us forget how hard it was when we were new to this because we've been using the "tricks" for so long...It can
be done, but for the sake of the snake, I'd rather they keep their energy up by eating a few live, & deal with switching them later. A snake that has never fed doesn't
"know" what it's like to feel "full"...once they eat a time or two, their appetite improves...they instinctively want to eat more & they more easily accept f/t or fresh killed.