The use of presidential executive actions are an attempt by the Executive Branch to simulataneously originate and enact laws whereas Article I of the US Constitution clearly states only Congress is the legislative branch of the United States and can originate laws. Articles I and II also clearly state Congress drafts the law which is then given to the President to sign (ie enact) or veto. In case of veto Congress can override such veto with a two-thirds approval in each house.
Using executive orders short circuits the constitutional protections of separation of powers and thus must be prohibited for the welfare of the nation.