Honestly, given the amount of sunroof leaks and/or wind noise complaints, it's probably a good decision. I'd bet they were getting a ton of (extended) warranty claims on sunroof leak issues and someone ran it up the flagpole to see if they could make this change. I actually think it's a good decision, albeit slightly disappointing.
Personally, i love the sunroof feature. I'm not sure if i would go for a glass panel now vs a solid roof if i were to upgrade in a few years.