Interesting article on why polymer outsells steel guns……nice read
gunmagwarehouse.com

Polymer vs Steel: Why Modern Polymer-Framed Pistols Outsell Steel-Frame Handguns - The Mag Life
The debate over polymer vs. steel isn't going to end, and depending on who you ask, you're likely to get all sorts of reasons why one is superior to the other. Polymer is stated to deliver lighter recoil impulse than steel because polymer flexes and bends during recoil.