Yes, and this is actually encouraged by Microsoft to avoid anti-trust action. As I said, take a look at ARM for what an actual locked-down ecosystem looks like.
Manufacturers inherently want to lock stuff down (for one, they sell more devices when someone wants to try out a new OS), but functionality being called a "standard" should actually be accessible to device purchasers.
Do you think their reaction to not having a standardized version would be "aw shucks, I guess we totally won't go with our own proprietary version then!"
If markets were perfectly efficient, then we wouldn't be having this conversation. In reality defaults matter, whether for a manufacturer following a standard or a consumer buying an off the shelf PC.
Manufacturers inherently want to lock stuff down (for one, they sell more devices when someone wants to try out a new OS), but functionality being called a "standard" should actually be accessible to device purchasers.