lots of very fine cutlery out there made from Stainless steel

No, companies mass produce millions of knives made out of stainless
steel that look pretty years after they go into a drawer. The website
you provided, shows the Ulu being "stamped" out of a giant roll of
stainless steel.

The problem is stainless steel is very difficult to get a sharp edge.
And yes, it is steel, but "soft" if compared to high carbon. If a
stainless blade is used daily, it will dull within weeks. High carbon
will go for months.