Absolutely this. They changed names, project format, build tooling, etc faster than the ecosystem could keep up. You couldn’t even be sure there existed a set of compatible ASP.NET Core, EF, and standard library packages in nuget without endless trial, error, and binding redirects.

I tried 2-3 times up to and including .NET Standard 2.0 to switch and got burned by busted tooling and package conflicts every time. I’m starting a new project now and am still wary.