This is an important point! Dribbble shots are usually not from actual products, so you can't use them as evidence for a real world trend.
Another point is that you should not generalize about the design of a product based on marketing pages. Often, the design for these pages is contracted out to studios who don't touch the rest of the product. How often do the products look and feel like the home page? Almost never.
Maybe this is a trivial point, but what I mean is: he shouldn't state this as if it were a product design trend, when (if it is a trend at all) it's a marketing trend.
Another point is that you should not generalize about the design of a product based on marketing pages. Often, the design for these pages is contracted out to studios who don't touch the rest of the product. How often do the products look and feel like the home page? Almost never.
Maybe this is a trivial point, but what I mean is: he shouldn't state this as if it were a product design trend, when (if it is a trend at all) it's a marketing trend.