I also believe it's just so we can look good.
You know it's better to look good than to feel good!
And yes it's my biggest fear of this unit in that approach to any stark incline or speed bump is gunna do some damage not to mention what a ripe armadillo's gunna do to my Formula 1 front end !
Saw one that didn't have the lower plastic on and it did look funky without something there. I'm not sure what to think about that part. It would be interesting to see someone (that does better body work than me) create something maybe not quite as big and low. I think Polaris may be selling a lot of parts involving that lower set of wings. Curbs, roadkill, ramps, etc...