Good notice, dear.
But shoulders make sense, when a thickness less than 3mm.
Left one Santoku has, but Deba(5mm) and another Santoku(4mm) doesn't.
All blades are not ready yet for assembling - need some work, I'll show later.
Probably they'll have a handles from a teakwood + some spacers...
The "shoulder" are you are referring to is called the Machi. Not all knives have a machi, and are largely due to regional difference, but also knife type. Debas in my experience, almost never have a Machi.
Many knives feature the highly debated "Machi Gap" where the handle does not meet the Machi.
I've started my job with Buffalo horn pieces, what I'm getting from India and found - that is the ACRYLIC!!!!!!!!!!!!!
Don't buy from that seller: https://www.bonehornmaterials.com/
And I wanted to sell extra pieces to some guy....
Thank to God It wasn't happened!!!!