WIP

Author: MichaelSimons

Documentation/eliminating-pre-builts.md

@@ -137,30 +137,15 @@ dependency causing the `System.Text.Json` pre-built.
 
 ## Allowed exceptions
 
-The list of permitted pre-builts can be found in the
-`./eng/SourceBuildPrebuiltBaseline.xml` file in the root of the repository. It
-contains package information of pre-builts that for one reason or another are
-allowed in the source-build of the repository.
+> **Note**: The information in this section applies to .NET versions **prior to 10.0**.
+> In .NET 10.0 with the [Unified Build project](https://github.com/dotnet/dotnet/tree/main/docs), prebuilt detection was removed from individual repositories.
+> Prebuilt detection is now only performed during full source builds within the VMR.
+> For .NET 10.0+ source-build instructions, see the [VMR source-build documentation](https://github.com/dotnet/dotnet/blob/main/README.md#building).
 
-Any new addition to the pre-built exception list must be signed-off by a member
-of the `@dotnet/source-build` team.
+The list of permitted pre-builts can be found in the `./eng/SourceBuildPrebuiltBaseline.xml` file in the root of the repository.
+It contains package information of pre-builts that for one reason or another are allowed in the source-build of the repository.
 
-A common example of a exception that is present in several .NET repositories is
-an [_intermediate
-package_](https://github.com/dotnet/source-build/blob/main/Documentation/planning/arcade-powered-source-build/intermediate-nupkg.md).
-When a repository utilizes an intermediate package, it will be excluded from
-pre-built detection with the following declaration in the above-mentioned file:
-
-```xml
-<UsageData>
-  <IgnorePatterns>
-    <UsagePattern IdentityGlob="Microsoft.SourceBuild.Intermediate.*" />
-  </IgnorePatterns>
-</UsageData>
-```
-
-With this ignore pattern in place, pre-built detection will not mark any .NET
-intermediate package as long as it conforms to the naming in the pattern.
+Any new addition to the pre-built exception list must be signed-off by a member of the `@dotnet/source-build` team.
 
 In cases where a specific package needs to be excluded from pre-built detection
 (for example, to not block the introduction of changes until a source-build