If there's no advantage to practicing on the pattern, then why did the USBC stste that as a reason for no longer releasing the pattern to make it fair to all participants?
I said there is no real advantage to practicing on the
exact pattern. If it's medium length (which it almost certainly will be), you'll be fine if you have experience on these types of patterns at home. If you don't, no amount of graph knowledge is going to save you.
The USBC can try to keep the pattern a secret all they want. But after the first week, bowlers who participate early will be blogging their experience all over the internet. Everybody will generally know what it is.
Even bowling the BJI ahead of time doesn't guarantee anything. The BJI reserved lanes generally play a little different than what you see in the tournament.
Keeping the pattern secret is going to accomplish little, so I don't know why the USBC did this other than to give into complaints. That's what people do.