I've watched world-class players pattern rack in tournaments... Dennis, Shane, Corey.
I have yet to see a single one of them run 2 racks the exact same way,
where every ball goes in the same pocket.
People cried about it when Dennis Orcullo did it,
and in
8 runouts there wasn't a single duplicated rack.
Pattern rack or not, there's still plenty of randomness in the break, and it's about
one in a million for the cue ball and every single object ball to end up within a foot of any previous break.
And this is a game of inches.
The reason these guys make it look easy is because they're that good.
If you allow them to soft break from the corner, the only way to slow them down is to
prevent them from making the ball on a break (aka give them a bad rack)
and guarantee they can't get a look at the most important ball in the pattern: the 1 ball.
The rest of the pattern is almost irrelevant if a player can make a ball on the break every time,
and control the one.