Kit mentioned that the black-plastic versions of the Gan X/XS/etc. have unified piece caps, so you can't just make a stickerless-black puzzle out of it. I
think the Valk Elite does this too; the promotional pictures suggest that the black-plastic version has unified piece caps.
This is only tangentially related, but I really dislike the
stickerless Valk Elite (
which I've mentioned before here), partly because of the capped design (which I haven't mentioned before). The Valk Elite's corner caps aren't held in very firmly, so they can get slightly dislodged and catch on other pieces mid-turn. (This happens especially often when I'm trying to do eido U2s and I'm not pushing the layer perfectly perpendicular to the axis.) I'm not sure if this is specifically because the stickerless version uses split caps, though, and perhaps the black-plastic version with unified caps also has this same problem.
What is more relevant is that while the corner caps of the (stickerless) Valk Elite can be pried off easily (exactly because they aren't held in firmly), the edge caps are nigh impossible to get out. There's barely any seam to use to push the caps out. Even if the black version used split caps, it would still be very difficult to make a stickerless-black version.