Thanks for the reply and the link. I'll stop worrying about it, and just be cautious on snow covered roads. We have had the MKZ for five months and love it. Comfortable, quiet, great handling (except on snow) fast, and beautiful to boot.
And how does it affect handling? I ask because our new-to-us 2015 MKZ is quite exciting to drive on roads with tire tracks worn into them or on roads with patchy snow cover. To say it is twitchy is an understatement. Having an alignment done helped on good roads, but did nothing for the aforementioned ones.