The point of 4H unlocked is to provide greater traction than 2H. You'll get 25% engine power to each wheel and they will be less likely to break traction initially. Also, you get to keep VSC, because that is disabled when the CDL is locked. I find 4H unlocked to be extremely useful, especially in winter conditions. On snowy roads RWD 2WD is not fun at all, haha. But 4H with ATRAC does a great job keeping me moving and VSC has saved me several time. The Torsen center LSD does a great job regulating the front to rear demands for the majority of offroading driving conditions I encounter.

As you become more familiar with your 4Runner, you'll learn what vehicle configuration works best for your needs. You might need the CDL more than I do if you're regularly lifting wheels.