Yes, in a sense of brand choices for firearms. Placement results show that every major brand has an option that supports a top shelf performance.
That said, people who took places from 4 to 9 are within 1.5% of each other (I am going by memory). I can't exclude that some equipment differences, especially in optic, may have lead to specific placement but not to making or breaking the top 10.
Such people don't show up at the Nationals. If USPSA asked this question before the Nats, or any level III match, no participant would care about egos, feel-goods about real world etc. People don't spend four digit sums and take off half-weeks to travel to attend activities where not one person gives a fuck about such things. USPSA is not asking this question simply because it is none of their business, not because they are concerned about offending somebody.