Hi Andrea,
really nice article and well-explained.
Did u know if the reloadOnChange setting works also for .NET Core User Secrets?
Up to now, I was not able to start a web API proj, change a secret and have this change reflected for the API. My thought was that the User Secrets were loaded once on application startup… Not very clear why there is also this parameter on extension method builder.AddUserSecrets() 
Let me kwow your thoughts.