for me the XDS-45 shoots very nicely. recoil is non issue. so i'm not sure why recoil in the shield 45 would be a major factor, especially since the gun has already seen years of 40S&W use.
bigger concern than recoil is 45acp ballistics when barrel is chopped down to 3.3". while there has been a great deal of 9mm testing out of short barrels with many loads still achieving reliable expansion out of 3" barrels, I feel the jury is still out there on 45acp from extra short barrels. and f it fails to expand then it isn't an SD option. this is subjective so i'm not saying applies to everyone, just me.
as much as I find S&W annoying, they do seem to pay attention to what consumers want which is cool. and if they build the shield 45acp to the same standards as the 9mm, they will have a fantastic seller no doubt.