The problem with the 2" mecnaums is that there is very little clearance between the rims and OD, when used on a ‘normal’ weight robot (~12-15lbs) the wheels will sink into the field tiles which inhibit their ability to strafe.
Going off of what @Amadeus said, one would probably use these wheels for intakes or some other system on a robot. I know in FRC, some small mecanums have been used to shuffle balls to the center of a feeder along a straight surface.
Perhaps teams whose Tipping Point season is over would be able to test applications for these. Drivetrains are not the only use - the small size and nature may make them useful as intake mechanism that center objects. For example, similar to IRI Mecanum Wheels for Intakes - DEW Robotics