I am truly not sure what evidence supports this thesis (aside from anecdotes pulled from a niche market that in no way represents tech-at-large nor the market nor all industries nor all team structures nor…), but I will say without reservation that any User Experience Designer or Information Architect who has spent days/weeks/years untangling the IA of client’s expensive, beautiful, and under-performing site will disagree.

In a certain company, in a certain environment, in a certain culture: maybe. But remove “deep UX expertise” from many given products (solutions) and you get a hot mess that someone — whether the user or the team tapped to design the replacement or the customer support team or sales or…— will have to clean up.

User Experience is an area of subject matter expertise. There are deep and diverse areas of associated study and practice— whether behavioral psychology or data-driven navigational design. The field has and will continue to evolve to the needs of user and product.

Other subject matter experts share, overlap, or even just have interest in these practices, just in the way that many a UXD can code up a landing page “pretty ok” or even great. But its unlikely and probably even not recommend that same UXD would or should be architecting a database, configuring a load balancer, or pushing the associated crafts/arts/sciences forward.

The highlighted statement might be true in one shop, one culture, one industry, one locale- but in no way represents the current reality of many teams, nor a necessary reality.