Yeah that remote is funky design. While it is a trigger remote, the throttle looks like it works on a slide mechanism. Not sure how you’d progressively apply the brakes with that remote. The fact that it didn’t work properly doesn’t help its cause.
Some people like the trigger, some people like the thumbwheel, this is would be yet another option to control your speed.
Grenade Control - sounds cool! But to be fair, the person who makes it get to name it!