Road racing adds elements that are not present in autocross, such as dealing with traffic and driving "alternate lines" to make passes and such. I wouldn't expect a driver with any amount of autocross experience to instantly be the best at actual RACING.

But, any GOOD autocrosser is "smooth". If you autocrossed for a few years, you should know this. Smooth = fast at an autocross. Smooth = fast AND safe on a race track. Smoothness and being familiar with how to handle a car at and beyond its limits are extremely valuable skills on a racetrack.

How many track events have I done? Not that it's relevant to this discussion, but I've lost count. I started doing track events in 2002, and I've done track events, time trails and races on about a dozen different tracks across the US in at least 7 different cars. I'm not "just an autocrosser", thanks for playing.

I've seen, ridden with, and competed against drivers with and without autocross experience on racetracks. When sharing the track with someone who has never been on a track before, I'd always prefer to share the track with someone who has autocross experience than one who doesn't. The more the better.