Equipment manufacturers are starting to use 20amp IEC inlets on their gear because it is a more solid connection than the 15amp IEC.
Rex
I would be curious if the power cord that came with unit did/does have a 20 amp plug on the end of it.
The manufacture of the equipment may want to make sure the user connects the equipment to a 20 amp branch circuit to insure the best performance of the equipment.
If the equipment is Listed and has a 20 amp IEC connector my interpretation is the plug on the cord supplied with the equipment must also be 20 amp.

