When the updated Dell XPS-13 comes out next week, I suspect it will utilize an OEM driver because Dell is well-aware of Microsoft's FAILING in this area.
It doesn't matter which driver used: if a Dell device has the issue, you have to talk to Dell. Even if it was the MS Driver, it's Dell's device. If they shipped it with a bug, even Microsoft's bug, you have to talk to them. They integrated it and chose to use that driver, and they are responsible for everything, even the core OS they use. That's their commitment. If they also believe the fault lies with Microsoft, they will work with Microsoft to open their own support case.
On the other hand, if you own a device manufactured by Microsoft (like a Surface) and have this issue, then you should open a support case with Microsoft (http://support.microsoft.com).
I understand the frustration and I'm not trying to be malicious, that's just how it works. The OEM is exclusively responsible for what they sold, including all software they included with it, from the OS to the pre-installed apps.