Where you need to rewrite an existing Web Form to ASP.NET MVC, remember that you wrote that form the way you did because you wrote it in Web Forms. If you'd written it in MVC, you'd have done it ...

Take advantage of the friendly syntax of Razor View Engine to more easily create views from templates in ASP.NET Core MVC.

Web Parts and User Controls let you easily build customizable UIs with the same tools you use to create inflexible user interfaces -- and implement an MVC-like pattern in ASP.NET.