In the past, before all the changes to the break in 9ball, running out at the pro level was more often, and it wasn't uncommon to see a players run a bunch of racks in a raw. back then, the ability to string together run-outs was indeed a mark of level of play, so I get where the focus on running out racks comes from.
If you play 9ball by old break rules and racking, then running out is something to strive for. If you rack and break by WNT rules then the ability to run out is just luck on how the balls land after the break.
BTW, even if the 9 is on the spot with template racking but without restricting to breaking from the box, running out is still in high percentage, as breaking from the rail with a square hit at the right speed (of the table) will send the wing ball to the top corner and the 1 ball towards the bottom corner leaving in most cases an easy start on the 1ball and a good chance to run out.