Out of Tree Drivers in Unraid - What Makes a Driver Break?

When we compile our lennox colonel for a release of un raid, we pull in drivers that are built into that lennox Colonel. However, there's another kind of driver, and these are out of tree drivers. Out of tree drivers are drivers that are also made by a company or an individual, but they are not merged into the lennox colonels. One reason could be a licensing incompatibility. For example, sa reason why z f s currently is not a native part of the lennOx colonel. And it has to do with licensing. It could also be that the vendor is trying to protect some type of proprietary technology in their hardware because they don't want