redsevnWell, given that they're CNC milled and not cast or 3D printed, there's not a lot you can do about that without vastly increasing the time of manufacture. It seems like this provider is dependable, but a small shop so they probably only have one or two machines to crank out dice on. The font is probably just the manufacturer using a ball end mill to get a nicely rounded bottom.
I'm interested to know how the odder polyhedrons are made and have their faces aligned. My initial guess is that they're cast (hence the soft edges) and the manufacturer has some custom clamp forms to make up for the non-flat sides.