I don't know where you guys get that you can't use your four-wheel-drive On dry pavement... And telling people to turn the four-wheel-drive on and off as your road conditions change is ludicrous ! There is no way that you can judge the road conditions fast enough to engage and disengage your four-wheel-drive. And if you're at Road speed there's a lot less rolling resistance than when your rock crawling.
What do you think rocks are...essentially natures pavement. You don't go to Moab and not use four-wheel-drive because it's dry rock. I've never gone rock crawling and not used my four-wheel-drive because it's dry rock.
There's thread after thread about how durable the wrangler is... Yet people make it sound as if you drive a couple blocks with your four-wheel-drive on it's going to blow up on you.