This is a good thing. It seems that every VW over the last 10 years that had a pano roof has leaked. By making it fixed glass, you really don’t need to worry about that anymore. I much prefer this.
But I would guess that the logic behind this is weight. Most people don’t open their pano roofs but like them for the extra light they bring in. Having those sunroof motors just adds weight, complexity, etc.
Tesla and the Mach E both have fixed glass pano roofs also