Fortunately the upgrade path has not been too bad once you get to .NET Core. Usually one time changes to your Program.cs and Startup.cs files. The Top-Level statements addition is pretty jarring at first, but a cool addition. I did run into a breaking change from .NET 5 to 6 with an Encryption library not working right. But most everything else just works when upgrading. If it was just .NET additions life would be fine. It is the front-end churn that causes real stress. AngularJS, TypeScript, Angular, React, Blazor, WebPack, Vite, etc.