I'll pass this on for what it's worth. My boss of many years ago had me make arrangements for shipping a classic car on a trailer. He specifically asked me to ask about buying a cover to protect the car. The transportor emphatically told me not to cover it, as the wind would whip the cover around and damage the paint.
If the bike is truely out of the slipstream, it might not matter. Anyhow, I might be proud to ride a bike with spattered bugs on the front.
Some people are like a Slinky ... not really good for anything, but you still can't help but smile when you shove them down the stairs.