A respectable and valid answer. I've worked on everything. And your right about the all wheel drive systems with Jeep and Subaru, I would also include Audi, and Porsche to that list. But I think that Lexus along with Acura and a few others know that the RX and MDX and others will never see a real dirt road. The all wheel drive systems are more just improved traction in weather conditions, such as rain and snow. Not so much terrain conditions. And I think the RX just designed with a different philosophy. I think that there are basically 2 design ideas. A truck with car like abilities, and a car with truck like abilities. It sounds to me like you like the truck with some car like abilities better than the RX which is more a car with truck like abilities.
Although, I do think that some of your issues are due to the fact that your 6'7'' and not so much a deficiency in the RX design. American made vehicles have allways seemed to cater to the larger, taller person than most of the Japanese, and even European designs.
But to be clear, I understand your points. I have found it troubling about the past transmission issues. It seems they have since corrected it, but it does little for the vehicles that are already out there.