Again with the prior flight time question... look, it's a "nice to have," that's it. Most emphatically nota pre-req. I think most IPs would rather train you up from scratch than have to de-program bad (or at least non-Navy) habits acquired over a lot of private time.
IFS is really for finding out if you're trainable. And if you're incurably airsick, we'd rather find out sooner than later.
It's really more of a matter of "what you do with it" rather than "what you have" in terms of prior flight experience.
I have literally seen guys with no flight experience at all end up as MAWTS instructors and Blue Angels. These guys knew nothing ahead of time and just worked hard and learned fast.
I have also seen guys who came in with their ATP get attrited from the RAG.
One of my roomates in advanced nearly got attrited, and he was a mutli thousand hour ATP when he started. In the end he begged for Prowlers, but his boat grades were so bad that he got Hornets. He was one of these "I've seen all this before" and "That's not the way we did it at my company" type of guys.
If you want to learn to fly civilian, then by all means do so. If you think that it's a free ticket to getting jets (or whatever), then you're sadly mistaken.