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@gbj_tester
Also higher chain tension, more chain bendáge and corresponding lower efficiency. Changing pitch doesn't get you round the fundamentals of roller chain transmission physics, and all the "advantages" of 10mm pitch were also claimed for MicroDrive, using lower tooth counts on ½" pitch, equally fallaciously. You get the same effect by using 40/16 ½" pitch as you get from 50/20 10mm pitch. Yes, the mini drive train is lighter (although small ½" pitch is better than 10mm in this respect, since you also cut the number of rollers, bushes and pins), but light weight is not something to chase after at the track if it compromises drivetrain efficiency. That's why nobody* uses 12t sprockets at the track, you're always better of with a 13t and a bigger chainring.
*Some tosser will now find an example, e.g. Obree, but he's a freak.