For the most part you will see the back wiring push-in on residential work. All of the Commercial work we design we spec, requires side wiring.
If the receptacle is UL listed, it has been tested and complies with UL testing requirements regardless of the connection method.
The issue with residential wiring is most electrical contractor will use the smallest/shallowest single gang outlet box they can get to save money and when you leave 6" leads in the box, and you push the receptacle in the box, it will over bend the wire and that's usually what causes the stress issue.
On commercial work, we require the contractors will provide 4"x4" square boxes with single gang raised drywall plates which leave plenty of room for the device and the wiring.