If you look in device manager and right click on the adapter select properties then choose driver tab and then driver details you can see who wrote the driver.
Here is a graphics driver that says it is Microsoft but when you actually look at the provider it is NVIDIA that makes the driver it is just signed by Microsoft since it comes in through Windows update.
Didn't say it was only Dell but that is what you used as an example. The longer people let device makers push blame the longer you will have an issue. They are the only ones that can fix the issue since it is their fault.
Microsoft doesn't make hardware function driver aside from some basic ones like the basic display adapter. The functionality of a third party device is left up to the vendor of that part or the device manufacture such as dell.