'Is there a downside of using $_REQUEST for all request type?

I am creating an MVC project in PHP and created a Request class for request handling. I want to get parameters by one function. Can I use $_REQUEST directly or need to check something? I could not think of an edge case.

public function getParams($key = "") {
    return $key ? $_REQUEST[$key] : $_REQUEST;
}
phpapimodel-view-controllerrequestbackend


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