IMO, the world of autocross is similar to other motorsports in some respects, and in others is far separated. The nature of the sports makes it that way, same as drag racing and oval racing in particular.
One thing that frustrates me about it is the emphasis on cost-cutting that sometimes is just sickening. But at the same time, sometimes very high-end, expensive hardware and engineering is utilized. As I type I'm flipping through Richard Newton's book, Autocross Performance Handbook, that I bought a couple years ago, and I've already found one picture in particular of an old M-series BMW's strut tower, showing the fluid reservoir for the guy's 4-way Moton coilovers. The caption says, "The four-way Motul [sic] shocks cost more than most of the cars I've raced. This is some very serious equipment. The good part of autocross competition, though, is that a good driver can usually beat good parts. That's why autocross is so much fun for average people."
Spelling error aside, the author acknowledges expensive parts, but goes on to say that better parts don't necessarily net better results. That's a rule that follows in most other, usually amateur, types of motorsport.
A local fellow races a dark gray EG hatch, with a lot of nice parts that you'd see on any other circuit-driven Civic. The main differences between his car and the other type of racer were that his wheels and tires were a bit smaller diameter, and slightly wider. He consistently won events, not because he had "$20k coilovers", but because he was a good driver. Very smooth to the point of looking slow. Most of the Miata guys were hacks, to be honest. Even cars with fat tires that stuck out past the fenders and parts galore couldn't win because they sucked. He raced on Lenso 14s with V710s, and he drove on the street with Team Dynamics. Pretty nasty, proper car. Besides the wheels there wasn't anything particularly autocross-specialized about the car, and he told me he'd driven a bunch of track days at Mid Ohio. How about that? A car that wasn't "purpose built" consistently beating "purpose built" autocross cars.
I guess my point here is that typical autocross modifications, like those ridiculous steelies and foot-wide slicks, don't necessarily make the car any better than what a good driver can muster. In the end, they end up looking ridiculous. Beyond that, the sport's nature, with constantly changing course designs, strict time limits, short runs, and soft track edges do not promote precise driving. Because it's nearly impossible to develop a routine and perfect a technique and know the track like the back of your hand, a common strategy is to cover for the deficiency - no fault of the driver's in many cases - by over-doing the car itself. If you shove enough tire under there you'll never screw up because the grip limits are astronomical. Luckily the Civic driver didn't fall for it, and instead was interested in honing his driving techniques elsewhere so he could bring his smooth, consistent style back to the autocross course where he could run for cheap and compete with all his friends.
Autocross is fun. It's inexpensive. But it's also very imprecise in general. I'm one to take pride in the perfection of my hobbies, and when I'm doing something I love like driving, "good enough" doesn't cut it. That's why I dislike the sporting aspect of autocross, though I do find it fun to toss the car around, be around cars, talk about cars, spin out occasionally, etc.