I am not 100% sure, but would think it would make sense. If I had to guess they buy chains at one length from whoever their chain company of choice is. It would make sense that if say they have 1000 x 114 link chains sitting around that they would not want to cut 1000 chains. Even if it takes an extra 30 seconds that means they have to pay 500 minutes worth of time to cut chains down. That is one persons job for the whole day basically, instead of fixing a real issue that may be happening with the thousands of bikes that they have rotating in and out of service.

I know that isn't much, but another factor is that they don't have much room in the dropouts or with the chain guards. So they can't get too crazy, at most maybe one tooth difference so I would assume that it should be close to the same chainring and cog.