TL;DR = A tablet-shaped device without a front facing screen is appealing only to a limited audience with specific use cases in mind, notably not making calls or consuming audio/video content.
Think there’s more nuance to this. Article actually talks about the concept of form and function as appealing to different subsets of mobile consumers. Motivation for surface duo is productivity - the design revolves around this I.e. form derivative of function
Samsung fold on the other hand revolves around the convenience of streaming and gaming, basically having a larger screen for a better experience. A convenience driven design appeals to a broader more general consumer base
Samsung fold on the other hand revolves around the convenience of streaming and gaming, basically having a larger screen for a better experience. A convenience driven design appeals to a broader more general consumer base