Neg G's are a valid tactic when on defense during BFM and other times.
We do neg-Gs for a reason, not just. . .well. . .because.
Flopping around is done all the time. . you fly the jet to the edge of then envelope, and because of that sometimes you exceed the envelope, and sometimes this means departing controlled flight. . and then you use your skill to save the jet and yourself. Basically, you become quite comfortable in the jet under all conditions and phases of flight/non-flight. Inverted spins, been there. Snap-rolls. . .done that. Zooming and backsliding down “in reverse” been there, too.
Cheers.
"That guy" (Sean Tucker to the rest of us) has 21,000 hours and is one of the best aerobatic pilots in the world, if not the best.
And that just makes your remarks asinine.
Your ego is writing checks your body can't cash.