So that the coverlet reports can be easily used by other MSBuild tasks. For example, using [ReportGenerator](https://github.com/danielpalme/ReportGenerator#usage--command-line-parameters) to generate an html coverage report.
```xml
<Target Name="GenerateHtmlCoverageReport" AfterTargets="GenerateCoverageResultAfterTest">
<ReportGenerator ReportFiles="@(CoverletReport)" TargetDirectory="../html-coverage-report" />
</Target>
```