How is the new Microsoft.AspNetCore.Testing different/better than Microsoft.AspNetCore.Mvc.Testing?

[VictorioBerra]

Additionally, Microsoft.AspNetCore.Testing is never mentioned in the docs: https://learn.microsoft.com/en-us/aspnet/core/test/integration-tests?view=aspnetcore-8.0

Is Microsoft.AspNetCore.Testing just a much simpler option when less customization is required for the test host? Is it intended to eventually replace Microsoft.AspNetCore.Mvc.Testing? Why is it needed?