Since GitHub is owned by Microsoft and their other product has had this, I’m guessing it’s yet another copy-over like GitHub Actions was from Azure Pipelines.
Not sure how long it’s been in AzureDevOps but it could have been inspired from GitLab there I suppose.
I wouldn't mind if they converged the products tbh, but there are quite a lot of things yet to migrate I think. An extensive process thing with easy ways to hook in for doing processes and reports would be much better than what ADO does now with an extremely complex model that you invariably still need to customize with extensions and hooks.