I suspect the reason is, it's 2 less items on the production line.I expect Phil is right but the didn’t put them on the diesel either!
For some reason I mentally put a smiley face on every post you post.So, what you're saying is, no protection on the driver side. So, when rock crawling, keep to the left. Got it.
Unless you install monster 245/75 mud tires. It shouldn't be a concern with all that extra ground clearance.
I don't think a piece of plastic will help when rock crawling