F-3 mode is used in the DA by most who come there no matter how much the say they don't. That is how they make those fantastic deflection shots in there you never see in the MA or move at just the right time to avoid your fire.
You've been saying exactly the same thing without variation or evidence for as long as I've been here like a tragically broken record or the last remaining member of the Flat Earth Society.
I flew the lake non-stop for years, blind, under the nose shots and extraordinary angle deflection shots account for at least half of my shots and I do not use F3. I can do it MA / DA doesn't matter. Any instinctive stick can sense the moment the opponent is going to fire, you don't need F3 for that either.
Just because YOU can't do these things doesn't mean others can't.