?????????? Good grief. Other than the 20" wheels on the Limited, why wouldn't it be?
When you lock the center diff on a Limited, the front and rear axles turn at the same speed. When you put an SR5 in 4WD, the front and rear axles turn at the same speed. Explain the difference to me.
I don't see anyone other than yourself arguing that.
No, it doesn't. See:
2010 Lexus RX350 Review & Test Drive | Automotive Addicts
Additional note, AWD is also active on the RX when taking turns. Basically, the RX is designed where it applies power to the rear tire when you are in situations where the extra propulsion is useful. Otherwise, it is FWD.