If anything, it's a default to have them on in any reasonably recent project - you get that with all templates, default projects, etc. Actively maintained libraries are always expected to come with NRT support. If this is not the case, it's usually a sign the library is maintained by developers who ignore the conventions/guidelines and actively went out of their way to disable them, which usually a strong signal to either file an issue or completely avoid such library.

Similar logic applies to code that has migrated over to .NET 6/8, or any newly written code past ~.NET 5.