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When you keep reducing the amount of cars on the track and you are running on a 4 mile one, the cars can spread out. On the other hand, one mistake in the kink by one driver can throw out the caution. Like last year where two drivers couldn't calm down early and that turned into a debacle. So, it takes 20-25 minutes for a typical IMSA Road America caution and you only have a 120 minute race. So, a short 2 lap one where everyone can come in right away makes more sense. Split class pit stops were because in GA, we ended up having 105 cars show up at VIR back in 2005 and there were only 35 pit stalls. Now you only have 32 cars and 45 stalls. many just sit empty and you can literally put enough of a gap on pit road that everyone has plenty of room.
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