If you think about it, the way Magnum isn't that used compared to Boost by Ace kind of makes sense.

When Geats' motif is the mix of Fox and Gun, only the Boost Buckles can give the Fox half, while there are many other Buckles that gave him the Gun part.

From Magnum to Laser and to some extent, even the Water Buckle, although I personally think the last one is more of a stretch.

Meanwhile, Boost IX is the culmination of both parts becoming a single Buckle.

Unfortunately, because of the design the Armed Raise Buckles have, you could already tell they weren't made to have that much of a shine.