I think they just arbitrarily made that design on their tailcap, not thinking that other lights that used a similar design actually had them for trits.
Jetbeam RRT-01 2019 design team meeting:
Joe: "Hey guys, it's time to redesign the RRT01 for the new year. Today let's talk about what changes we should make to the tailcap."
Bob: "People complained about the old RRT-01 tailcap. They didn't like the stainless steel lanyard ring. It looked too much like a pushbutton and confused people. Also, the way the tailcap tapered in made tailstanding unstable. And if you used a lanyard it couldn't tailstand at all."
Bill: "Actually nobody ever used a lanyard with the RRT-01. I think we should ditch the lanyard ring."
Joe: "Got it. So flat base for better tailstanding and no lanyard ring. The bottom of the light looks really boring now. We should liven it up with something."
Bob: "I've noticed some other manufacturers put these little teeny tiny slots on their lights to make them look cool. How about we do the same."
Bill: "Are you sure these random slots are a good idea? They look like they would collect dirt. I wonder why other manufacturers add them."
Joe: "Who knows. But apparently customers like them. Random decorative slots in the bottom of the light. Make it so!"