It seems redundant to have two different regulatory systems for slightly different kinds of speculation.

I think it's fine. Here renting (or teaching) light sails (light catamaran) needs a different license than renting (or teaching) any sail cruiser, including catamarans, despite being basically the same object (boats with sails). Feels that the small differences are enough to justify a different regime.

There are all sorts of different regulatory systems for all sorts of slightly different kinds of things.