All my career, On a receptacle with No compression plates for the conductors,backtwist the strands, wrap around the screw and tighten.
Now a major debate has developed over the manditory use of crimp connectors (sta-kons) based on 110-14a.
(A) Terminals. Connection of conductors to terminal parts shall ensure a thoroughly good connection without damaging the conductors and shall be
made by means of pressure connectors (including set-screw type), solder lugs, or splices to flexible leads. Connection by means of wire-binding screws or studs and nuts that have upturned lugs or the equivalent shall be permitted for 10 AWG or smaller conductors.
Terminals for more than one conductor and terminals used to connect aluminum shall be so identified.
I don't see the words "shall not".
If someone wants to say you have to use "sta-kons" ask them to show you a requirement to do so. At a minimum show you (and me) where on the outlet it says "for solid wire only".