Twosun TS64 Follow-up Review & Why can't makers do Thumb Holes Right? Koenig Kansept Sixleaf

One year anniversary of owning the sweet Twosun TS64. Spoiler, it's still great! But why is the thumb hole on the 64 so perfectly matched to the frame, while others look like a mix of two different knives. The blade off one, the frame off another, thus the thumb hole doesn't match anything. Or are designers/makers really this unimaginative and lazy?
You decide! And have a nice day!