If the two halves are cut at an angle, you will be hard pressed to find the seam even with a loupe. The woods used can also determine the level of being hidden.
Ebony....you'll never find the seam unless you get into a very high power magnification and spend a long time looking. But at what end means?
Lighter colored woods may be a bit easier to spot but still, who cares?
The mark of a master craftsperson is how well they hide any mistakes or items not meant to be seen with the naked eye.
The cue in pic 1 is marketed and sold as a limited edition full splice construction. To a non-cuemaker, that design looks more like a half splice 3 piece butt and that led to the asking.
Yes indeed on the cut angles that you pointed out and I agree on the mark of a master craftsperson part too.