What would be the consequences of passing all variables from controller to view?

What could go wrong if I always pass all variables to the view like this?

public function index(){
    $var1= '1';
    $var2= '2';
    $var3= '3';
    $var4= '4';
    $var5= '5';
    $var6= '6';

    return view('index',compact(array_keys(get_defined_vars())));
}

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