I upgraded to .NET 8 recently and I love primary constructors. I don't use them everywhere but they are great for dependency injection or for small classes.
https://mareks-082.medium.com/dark-side-of-the-primary-const...
Let's just say they could have done a much better job on it. It feels rushed and haphazard for such a mature language.
I think, as a feature, this is sort of the MVP. They could have done a better job of it by adding more to it (e.g. maybe allow the readonly modifier on the constructor properties). It's hard to imagine them being able to take anything away from primary constructors that would make it better.