Used to bother me too... not any more. The tank, side covers, and fenders on my Honda woods motorbike are all plastic and hold up WAY better than the steel parts on the machines I grew up with. My neighbor's Kawasaki Mule.... plastic. Know these parts aren't just made from just any 'ole stuff either. They are highly engineered composites that hold their shape and color VERY well.... even when left out in the sun. They also give the stylists complete control over the design.... no constraints like stamping steel requires.
When I travelled for Deere I often met engineers from competitor companies (trades shows, etc)... they salivate over the plastic styled parts JD uses and would go there in a heartbeat if it wasn't for the high capital cost (a hood tool can be $600k). Get used to it... it's here (just look at your car).