this is because you do not have strict requirements on your own code. For example, Event, in laravel is a listener mode. If you use it or not, the effect is the same, but you have his advantage in code maintenance or structure. You are already built in various design patterns with yii2 or laravel, but what you write under this big framework is too simple. Design patterns can only see its advantages in large project structures. If you don't understand it or the code structure is simple, design patterns will only make you feel troublesome

1. Because the framework you use is already designed by design patterns, you don't need to consider design patterns, you just need to write your logic
2. Your business logic is not complex enough, so you don't need to use it. If there is a need to add 5 third-party login methods now, it may be added in the future. What will your code do? If your login is not decoupled from user management, then every time you change the login mode, you have to change user management and log out
3. Then there is the question of language. After all, this is a PHP, a weakly typed language. There are no restrictions on the return of php. You can return whatever you want. Strongly typed languages are not allowed.