IMHO:
We use the screw/loop method; or with 'spec' grade devices the "insert & tighten the screw" method.

THe majority of our work is comm...so the 'option' to 'backstab' the #14 into the recept's don't happen anyway. Smallest we use is #12.

As to wire nuts, my guys have any choice they like...wings, regulars, skirted, etc.

The WAGO things have not been a popular item, with the exception of ballast wiring.

John


John