Generally the whole area gets a continuous stream of small and big features. You can click through the release notes [1] and see the changes they've made. Over the past twelve or so months they've jettisoned XAML-based builds and added YAML builds.

As someone who's used it through VSO/VSTS/ADO days it's got foibles but yes, it's improving continuously.

[1] https://docs.microsoft.com/en-us/azure/devops/release-notes/