Static instance of the Monobehaviour object?

Question

Unity

Please tell me, I found an example of a class that can be accessed from anywhere by creating a static entity of this class in the Awake method.
public static GameClass instance = this;

From any other class, you can now access the public methods and properties of this class.

GameClass.instance.SomMethod();

Similar to a singleton, but without uniqueness checks.
What are the disadvantages of such an approach? Is it possible to do so?

Answer 1

This is the singleton.
You can do it if you understand the consequences and causes of occurrence.
Well, what are the shortcomings ... Connectivity, architecture, life control ... Everything is classic.