Interface redesign?

[Lakritzator]

e.g. use something like:
https://github.com/aspnet/Hosting/blob/80ae7f056c08b740820ee42a7df9eae34541e49e/src/Microsoft.AspNetCore.Hosting.Abstractions/IHostedService.cs

[Lakritzator]

And https://github.com/aspnet/Hosting/blob/80ae7f056c08b740820ee42a7df9eae34541e49e/src/Microsoft.AspNetCore.Hosting.Abstractions/IHostingEnvironment.cs

[Lakritzator]

and https://github.com/aspnet/Hosting/blob/80ae7f056c08b740820ee42a7df9eae34541e49e/src/Microsoft.AspNetCore.Hosting.Abstractions/IApplicationLifetime.cs