Larvel 5: Password Reset - bcrypt password in User.php model?

I noticed that some developers modify PasswordController.php so that the method resetPassword($user, $password) does not bcrypt password. Instead, the password is bcrypted in model User.php.

Here is an example of that: *app/Http/Controllers/Auth/*PasswordController.php:

<?php

namespace SundaySlim\Http\Controllers\Auth;

use SundaySlim\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\ResetsPasswords;

class PasswordController extends Controller
{

   use ResetsPasswords;

  public function __construct()
  {
      $this->redirectTo = route('backend.dashboard');
      $this->middleware('guest');
  }

  protected function resetPassword($user, $password)
  {
     $user->password = $password;
     $user->save();
     auth()->login($user);
  }
}

As you can see, there is resetPassword($user, $password) method copied from vendor/laravel/framework/src/Illuminate/Foundation/Auth/ ResetPasswords.php. It is modified so that there is no bcrypting password.

Here's how this method originally looked like:

protected function resetPassword($user, $password)
{
    $user->password = bcrypt($password);

    $user->save();

    Auth::guard($this->getGuard())->login($user);
}

(also, as you can see - Auth::guard($this->getGuard())->login($user); is changed to auth()->login($user);)

The idea is to create a mutator in model Users.php in which password will be bcrypted.

So, here is the model User.php with that mutator:

<?php

namespace SundaySlim;

use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    protected $fillable = [
        'name', 'email', 'password',
    ];

    protected $hidden = [
        'password', 'remember_token',
    ];

    public function setPasswordAttribute($value)
    {
        $this->attributes['password'] = bcrypt($value);
    }
}

Questions:

1. What would be the reason to do something like that (to create a mutator in Users.php to bcrypt password AND NOT in resetPassword($user, $password) as it is by default)?

2. What is the difference between: auth()->login($user); and Auth::guard($this->getGuard())->login($user); ?

By the way, here is the routes.php:

Route::group(['middleware' => ['web']], function () {

    Route::get('backend/dashboard', [
        'uses'=>'Backend\DashboardController@index',
        'as'=>'backend.dashboard'
    ]);

    Route::controller('auth', 'Auth\AuthController', [
        'getLogin' => 'auth.login',
        'getLogout' => 'auth.logout'
    ]);

    Route::controller('auth/password', 'Auth\PasswordController', [
        'getEmail' => 'auth.password.email',
        'getReset' => 'auth.password.reset' 
    ]);
});

via Chebli Mohamed